Words And Life

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2D 3D 3M 4GL 4H 4WD A AA AA AA AA A&A AA AAA AAAL AAAS AAII AAMSI AAO AAP AARC AARN AARP AAS AAVSO AB ABA ABA ABA ABBR ABC

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2-Dimensional 3-Dimensional Minnesota Mining and Manufacturing Fourth Generation Language Head, Heart, Hands, Health Four wheel Drive (see also FWD) Aftermath Affirmative Action committee Alcoholics Anonymous Antiaircraft Artillery Associate in Accounting Astronomy and Astrophysics [Space] Automobile Association [England] American Automobile Association American Academy of Arts and Letters American Association for the Advancement of Science American Association of Individual Investors American Association for Medical Systems Informatics Anglo-Australian Observatory [Space] Affirmative Action Program Anglo-American Cataloging Rules Australian Academic Research Network [Networking] American Association of Retired Persons American Astronomical Society [Space] American Association of Variable Star Observers [Space] ABle seaman American Bar Association American Basketball Association American Booksellers Association ABBReviation American Broadcasting Company [Corporate name]

AC AC AC ACAA ACAWS ACBL ACC ACCS ACD ACE ACE ACE ACHEFT

Alternating Current (ac, see also DC) Ante Christum (before Christ) Ante Cibum (before meals) Agricultural Conservation and Adjustment Administration Advisory, Caution, And Warning System American Contract Bridge League Argonne Code Center Army Command and Control System Automatic Call Distributor [Telephony] Advanced Composition Explorer [Space] Advanced Computing Environments [Corporate name] Automatic Calibration and Equalization Automated ClearingHouse Electronic Funds Transfer

ACK ACL ACLU ACM ACRV [Space] ACS ACSE ACT ACT

ACKnowledge Advanced Cmos Logic American Civil Liberties Union Association for Computing Machinery Assured Crew Return Vehicle (or) Astronaut Crew Rescue Vehicle Advanced Communications System Association Control Service Entity (ISO/CCITT layer 7) Action for Children's Television (in Cambridge, MA) American Conservatory Theater ACTS Advanced Communications Technology Satellite ACTS Automatic Coin Telephone Service

[Telephony] ACU Alarm Control Unit ACU Automatic Call Unit [Telephony] ACW Alternating Continuous Waves AD After Date A/D Analog to Digital converter (see ADC) AD Anno Domini (in the year of our Lord) AD Application Development ADAP Alzheimer's disease-associated protein ADAP American Discount Auto Parts [Corporate name] ADB A DeBugger ADB Apple Desktop Bus ADC Analog to Digital Converter ADCI Automatic Display Call Indicator AD&D Advanced Dungeons & Dragons ADF Automatic Direction Finder ADM ADMiral ADP Adenosine Di-Phosphate ADP Administrative Data Processing ADP Advanced Data Processing ADPCM Pulse Code Modulation with Adaptive Quantization ADS Application Development System ADSR Attack Decay Sustain Release ADT Abstract Data Type ADT Atlantic Daylight Time AE Application Execution AEA American Electronics Association AEC Atomic Energy Commission

AEF American Expeditionary Force (see BEF) AEGIS Advanced Electronic Guidance and Instrumentation System AF Adventures in Fantasy AF Air Force AF Audio Frequency AFADS Automatic Force Adjustment Data System AFATDS Advanced Field Artillery Tactical Data System AFB Air Force Base AFC American Football Conference AFC Automatic Flight Control AFC Automatic Frequency Control AFCAC Air Force Computer Acquisition Center AFCC Air Force Communications Command AFGE American Federation of Government Employees AFIPS American Federation of Information Processing Societies AFL American Federation of Labor AFL American Football League AFLCIO American Federation of Labor and Congress of Industrial Organizations AFNOR Association Francaise de NORmalization AFP Appletalk Filing Protocol AFS Andrew File System AFSC Air Force Systems Command AFSCME American Federation of State, County and Municipal Employees AFTRA American Federation of Television and Radio Artists AG Adjutant General AG Arcade Game AG Attorney General AGCT Army General Classification Test AGN Active Galactic Nucleus [Space] AHL American Hockey League AHQ Air HeadQuarters AI Artificial Intelligence AIAA American Institute of Aeronautics and Astronautics [Space] AIC Automatic Intercept Center AID Agency for International Development AIDDE Ames' Interactive Dynamic Display Editor AIDS Acquired ImmunoDeficiency Syndrome AIOD Automatic Identification Outward Dialing AIS Automatic Intercept System AIX Advanced Interactive eXecutive (IBM's name for UNIX) AJ Astronomical Journal [Space] AK Alaska AKA Also Known As AL Alabama [US state postal designation] AL American League (baseball) ALA American Library Association ALA Automobile Legal Association ALBM Air-to-Land Ballistic Missile ALC Automatic Load Control ALGOL ALGOrithmic Language ALIT Automatic Line Insulation Testing [Telephony] ALPO Association of Lunar and Planetary Observers [Space] ALS Advanced Launch System [Space] ALU Arithmetic Logic Unit A&M Agricultural and Mechanical AM Amplitude Modulation

AM AMA AMA AMARC AMBA AMC AMC AMC AMD AMEX AMI AMORC AMP AMPAS AMPAS AMRAAM AMROC AMSAT AMU AMVET ANA ANAC ANC ANC ANDF ANF ANG ANI ANL ANOVA ANPA ANSI ANZUS AO AOA AOA AOL AOS AOS A/P AP AP AP APA APA APB APDA API APICS Ap.J APL APL APO APO APP APPC APR

Ante Meridiem (before noon) American Medical Association Automatic Message Accounting [Telephony] Automatic Message Accounting Recording Center Association of Master of Business Administration Albany Medical College American Motors Corporation(?) [Corporate name] Appalachian Mountain Club Advanced Micro Devices [Corporate name] AMerican EXpress [Corporate name] Alternate Mark Inversion (see also NRZ, NRZI, B8ZS) Ancient Mystic Order Rosae Crucis Adenosine MonoPhosphate Academy of Motion Picture Arts and Sciences Acedemy of Motion Picture Arts and Sciences Advanced Medium Range Air-To-Air Missile American Rocket Company [Space] radio AMateur SATellite corp. Atomic Mass Unit AMerican VETeran American Nurses Association Automatic Number Announcemnt Circuit [Telephony] All Number Calling [Telephony] Army Nurse Corps Architecture-Neural Distribution Format Automatic Number Forwarding [Telephony] Air National Guard Automatic Number Identification (see also: CLID) [Telephony] Argonne National Laboratory ANalysis Of VAriance American Newspaper Publishers Association American National Standards Institute Australia, New Zealand, United States Account Of Abort Once Around [NASA, Shuttle] Abort Once Around (Shuttle abort plan) [Space] Absent Over Leave (see AWOL) Academic Operating System Alternate Operator Service [Telephony] Accounts Payable Additional Premium All Points Associated Press [Corporate name] All Points Addressable American Psychological Association All Points Bulletin Apple Programmers and Developers Association Application Programming Interface American Production and Inventory Control Society Astrophysical Journal [Space] A Programming Language acute promyelocytic leukemia [Disease] Alpha Phi Omega, service fraternity Army Post Office Applications Portability Profile Advanced Peer-to-Peer Communications Annual Percentage Rate (as in loan interest)

APSE Ada Programming Support Environment APU Auxiliary Power Unit [Space] AQ Accumulator-Quotient register A/R Accounts Receivable AR Address Register AR Arkansas ARC AIDS-related complex ARC American Red Cross ARC Ames Research Center (NASA) [Space] ARCNET Attached Resource Computer local area NETwork ARO After Receipt of Order ARP Address Resolution Protocol ARPA Advanced Research Projects Agency (of the DoD, see DARPA) ARPANET ARPA (q.v.) NETwork ARRL Amateur Radio Relay League ARV American Revised Version AS Anglo-Saxon ASA Acetyl Salicylic Acid ASAP As Soon As Possible ASC Accredited Standards Committee ASCAP American Society of Composers, Authors, and Publishers ASCC Automatic Sequence-Controlled Calculator ASCII American Standard Code for Information Interchange ASDIC Anti-Submarine Detection Investigation Committee (British for sonar) ASDSP Application-Specific Digital Signal Processor ASG Automated Sciences Group ASHRAE Amer. Soc. of Heating, Refrigerating and Air-cond. Engineers, inc. ASIC Application Specific Integrated Circuit ASME American Society of Mechanical Engineers ASN Abstract Syntax Notation One (ISO/CCITT ASN.1) ASP Aggregated Switch Procurement ASRM Advanced Solid Rocket Motor [Space] ASSR Autonomous Soviet Socialist Republic AST Atlantic Standard Time ASV American Standard Version AT Atlantic Time ATA Automatic Trouble Analysis ATACC Advanced Tactical Air Command Central ATB Advanced Technology Bomber (stealth bomber) ATC Air Traffic Control ATDRS Advanced Tracking and Data Relay Satellite [Space] ATF Advanced Technology Fighter ATIS Atherton Tools Interface Specification ATLAS Atmospheric Laboratory for Applications and Science [Space] ATM Amateur Telescope Maker [Space] ATM Asynchronous Transfer Mode ATM Automatic Teller Machine ATO Abort To Orbit [NASA, Shuttle] ATO Abort To Orbit (Shuttle abort plan) [Space] ATOMS AT&t Optimized Materials Simulator ATP Adenosine TriPhosphate ATPCO Airline Tariff Publishing COmpany AT&T American Telephone & Telegraph [Corporate name] ATT American Telephone & Telegraph (normally written AT&T when seperate)

ATTIS American Telephone and Telegraph Information Systems [AT&T] (Division) ATV All Terrain Vehicle AU Astronomical Unit (93,000,000 miles) [Space] AU Astronomical Unit [Space] AUI Attachment Universal Interface AURA Association of Universities for Research in Astronomy [Space] AUS Army of the United States AUTODIN AUTOmatic DIgital Network AUTOVON AUTOmatic VOice Network AV AudioVisual AVLIS Atomic Vapor Laser Isotope Separation AWACS Airborne Warnings And Control Systems AWEA American Wind Energy Association AWK al Aho, peter Weinberger, brian Kernighan (pattern scanning language) AWOL Absent WithOut Leave (also Absent Without Official Leave) (see AOL) AW&ST Aviation Week and Space Technology (a.k.a. AvLeak) [Space] AXAF Advanced X-ray Astrophysics Facility [Space] AZ Arizona B Book B8ZS Binary 8 Zero Substitution (see also NRZ, NRZI, AMI) BA Bachelor of Arts BACH Business Alliance for Commerce in Hemp BAFO Best And Final Offer BARRNet Bay Area Regional Research Network (SF Bay Area) BASIC Beginner's All-purpose Symbolic Instruction Code BATSE Burst And Transient Source Experiment (on GRO) [Space] BB Bases on Balls BB Best of Breed BB Bunnies and Burrows BBA Bachelor of Business Administration BBB Better Business Bureau BBC British Broadcasting Corporation BBL Barrel BBN Bolt, Beranek, and Newman, Inc. [Corporate name] BBXRT Broad-Band X-Ray Telescope (ASTRO package) [Space] BC Battlecars BC Before Christ BC British Columbia BC/BS Blue Cross/Blue Shield BCD Bad Conduct Discharge BCD Binary Coded Decimal BCDIC Binary Coded Decimal Interchange Code BCE Before the Common Era (substitute for BC) BCNU Be Seeing You [Net jargon] BCP Byte Controlled Protocols BCPL Basic Combined Programming Language BCS Bachelor of Commercial Science BCS Binary Compatibility Standard BCS Boston Computer Society BCS British Computer Society BD Bachelor of Divinity BD Bank Draft BD Bills Discounted BD&D Basic Dungeons & Dragons

BDF Binary Distribution Format BDT Billing Data Transmitter BE Bill of Exchange BEF British Expeditionary Force (see AEF) BELCORE BELL COmmunications REsearch BEM Bug Eyed Monster BEM Bug-Eyed Monster [Space] BENELUX BElgium, NEtherlands, and LUXembourg BER Bit Error Rate BERT Bit Error Rate Test BEST Borland Enhanced Support and Training BF Brought Forward BFA Bachelor of Fine Arts BFD Bristol (RI) Fire Department (probably typical of any town starting "B") BH Black Hole [Space] BH Boot Hill BHP Brake HorsePower BICS Building Industry Consulting Services [Telephony] BID Bis In Die (twice a day) BIMA Berkeley Illinois Maryland Array [Space] BIOS Basic Input Output System BIS Business Information System BISDN Broadband ISDN (q.v.) [Telephony] BiSync Binary Synchronous Communications (BSC is preferred) [IBM] Bit BInary digiT BITNET Because It's Time Network BLAST BLocked ASynchronous Transmission BLERT BLock Error Rate Test BLF Busy Lamp Field [Telephony] BLT Bacon, Lettuce, and Tomato (sandwich) BLT BLock Transfer [Instruction] BLT Branch Less Than [Instruction] BM Basal Metabolism BM Bowel Movement BMA Bank Marketing Association BMEWS Ballistic Missile Early Warning BMO Ballistic Missile Office BMOC Big Man On Campus BMR Basal Metabolism Rate BNC Bayonet Neill Concelman (connector) [Electronics] (see also TNC) BNF Bachus-Naur Form BO Body Odor BO Branch Office BO Buyer's Option BOC Bell Operating Company BOD Board Of Directors BOF Birds Of a Feather BOM Bill Of Materials BOOTP Bootstrap Protocol [Internet] BOQ Bachelor Officers' Quarters BOS Business Office Supervisor BOSIX Biin Open System Interface eXtension BP Blood Pressure BP British Petroleum BP British Pharmacopoeia BPI Bits Per Inch

BPL BPL BPOE BPS BR BR BRA BRI BRIEF BRL BRS BS BS BSA BSA BSc BSC BSD BSN BSS BSTJ BT BTAM BThU BTL BTO BTU BTW BU BUF BV BWI BWI BX c C CA CA CA CA CA CAB CACM CAD CAD CAE CAE CAI CAIS CALS CAM CAM CAM CAMA CAMP CAP CAP

Boston Public Library Branch if PLus [Instruction] Benevolent and Protective Order of Elks Bits Per Second Bills Receivable British Rail Boston Redevelopment Authority Basic Rate Interface (ISDN) [Telephony] Basic Reconfigurable Interactive Editing Facility army Ballistic Research Laboratory Bibliographic Retrieval Service Bachelor of Science Bill of Sale Birmingham Small Arms Boy Scouts of America Bachelor of SCience Binary Synchronous Communications (also sometimes BiSync) [IBM] Berkeley Software Distribution Bachelor of Science in Nursing Block Started by Symbol Bell System Technical Journal British Telecom Basic Telecommunications Access Method [IBM] British Thermal Unit (BTU {q.v.} is preferred) Bell Telephone Laboratories Bachman Turner Overdrive British Thermal Unit By The Way [Net jargon] Boston University B-52 bomber ("Big Ugly Fellow") [USAF] Blessed Virgin Baltimore-Washington International (airport) British West Indies Base eXchange (see also PX) centi- (metric 1/100) programming language (successor to B, which was based on BCPL) California Chartered Accountant Chief Accountant Chronological Age Collision Avoidance (as in CSMA/CA (q.v.)) Civil Aeronautics Board Communications of the Association for Computing Machinery Computer Aided Design (sometimes seen as CAD/CAM) Computer Aided Dispatching Common Applications Environment Computer Aided Engineering Computer Aided Instruction Common Apse Interface Specification Computer-aided Acquisition and Logistics Support Computer Aided Management Computer Aided Manufacturing (sometimes seen as CAD/CAM) Content Addressable Memory Centralized Automatic Message Accounting [Telephony] Campaign Against Marijuana Planting Civil Air Patrol Columbia Appletalk Package

CAR CARE CARP CASE CASSIS CAT CATIS CATV CATV CAVU CB CBC CBD CBD CBEMA CBR CBS CBW CC CC CCA CCAFS CCC CCC CCC CCC CCCCM CCCI CCD CCD CCDS CCF CCI CCI CCIP CCIRN CCIS CCITT CCITT CCITT CCR CCR CCRI CCRP CCS CCS7 CCSA CCTA CCTV CD CD CD CD CD CDA CDA CDC

Contents of the Address part of the Register (LISP) Committee on American Relief in Europe California Air Resources Board Computer Aided Software Engineering Classification and Search Support Information System Computer-Aided Tomography Common Applications and Tools Integration Services Common Antenna TeleVision Community Antenna TeleVision Ceiling And Visibility Unlimited Citizens Band radio Canadian Broadcasting Corporation Cash Before Delivery Commerce Business Daily Computer & Business Equipment Manufacturers Association Chemical, Biological, Radiological warfare Columbia Broadcasting System [Corporate name] Chemical and Biological Warfare C (language) Compiler Carbon Copy Computer Corporation of America [Corporate name] Cape Canaveral Air Force Station [Space] Canadian Committee on Cataloging Civil(ian) Conservation Corps Command, Control, and Communications (sometimes C^3) Concourse Computer Center [MIT] CCC CounterMeasures (sometimes C^3CM) Command, Control, Communications, and Intelligence Charge Coupled Device (see CID) Charge-Coupled Device [Space] Centers for the Commercial Development of Space [Space] Hundred Cubic Feet Computer Carrier Interrupt Computer Consoles, Incorporated Continuously Computed Impact Point Coordinating Committee for Intercontinental Research Networking Common Channel Interoffice Signaling [Telephony] Comite' Consultatif International Telegraphique et Telephonique Consultative Committee on International Telephony and Telegraphy International Telegraph and Telephone Consultative Committee Commitment, Concurrency, and Recovery Creedence Clearwater Revival [Music] Community College of Rhode Island [Corporate name] Continuously Computed Release Point Hundred Call Seconds [Telephony] Common Channel Signalling (version #7) [Telephony, AT&T] Common Control Switching Arrangement [Telephony] Central Computer and Telecommunications Agency Closed Circuit TeleVision Carrier Detect (properly DCD (q.v.)) (EIA RS-232-C) Certificate of Deposit Civil Defense Collision Detection (as in CSMA/CD (q.v.)) Compact Disk Call Data Accumulator Compound Documents Architecture Centers for Disease Control

CDC Control Data Corporation, Inc. [Corporate name] CDEV Control panel DEVice CDIAC Carbon Dioxide Information Analysis Center CDO Community Dial Office CDR CommanDeR CDR Contents of the Decrement part of the Register (LISP) CD-ROM Compact Disk Read Only Memory CD-ROM Compact Disk Read-Only Memory [Space] CDSF Commercially Developed Space Facility CDT Central Daylight Time CDU Control Display Unit CE Chemical Engineer CE Civil Engineer CE Common Era (substitute for AD) CE Corps of Engineers CE Customer Engineer (see also FE, SE) CEA Commissariat a l'Energie Atomique (Frenc Atomic Energy Commision) CEA Council of Economic Advisors CEA County Education Authority CEC Commission of the European Communities CED Committee for Economic Development CELSS Controlled Ecological Life Support System [Space] CENS Centre d'Etudes Nucleaires de Seclay CENTO CENtral Treaty Organization CEO Chief Executive Officer CERFnet California Education and Research Federation Network CERN European Organization for Nuclear Research CERN organisation (formerly Conseil) Europeenne pour la Recherche Nucleaires CERT Computer Emergency Response Team CEVI Common Equipment Voltage Indicator CF Carry Forward CF Coin First (payphone) [Telephony] CF Cystic Fibrosis [Disease] CFA Center For Astrophysics [Space] CFC Chloro-FluoroCarbon [Chemical] CFC Combined Federal Campaign CFD Computational Fluid Dynamics CFHT Canada-France-Hawaii Telescope [Space] CFI Cost, Freight, and Insurance CFL Canadian Football League CFO Chief Financial Officer CG Coast Guard CG Commanding General CGA Color Graphics Adapter CGCT Compagnie Generale de Constructions Telephoniques CG&E Cincinnati Gas & Electric CGE Compagnie Generale d'Electricite CH Cardboard Heroes CH ClearingHouse CH CourtHouse CH Customs House CHA Champions CHAP CHAnnel Processor CHARA Center for High Angular Resolution Astronomy [Space] CHI Chill: Adventures into the Unknown

CHOTS CHP CI CIA CIA CIC CIC CIC CICA CICS CID CID CID CID CIDIN CIM CIO CIRRIS CISC CIT CIT CIT CLASP CLASS CLI CLID CLNP CLNS CLR CLRC CLU CLUT cm CM CM CMC CMD CMIP CMIS CML CMMU CMOS CMOT CMRR CMS CMSgt CMU CMYK CN CN/A CNI CNN CNO CNO CNR CNR CNRI

Corporate Headquarters Office Technology System California Highway Patrol Cubic Inches Central Intelligence Agency [US Government] Culinary Institute of America (Hyde Park, NY) Carrier Identification Codes [Telephony] (10XXX codes) Committee on Institutional Cooperation Coordination and Information Center [CSNet] Competition in Contracting Act Customer Information Control System [IBM] Caller ID [Telephony] (see also: CLID, ANI) Central Institute for the Deaf Charge Injection Device (see CCD) Computer Integrated Design Common Icao Data Interchange Network Computer Integrated Manufacturing Chief Information Officer Cryogenic InfraRed Radiance Instrument for Shuttle [Space] Complex Instruction Set Computer California Institute of Technology Case Institute of Technology (part of CWRU, Cleveland, OH) Circumstellar Imaging Telescope [Space] Comprehensive Logistics Automated Support Program Custom Local Area Signaling Service [Telephony] Command Line Interpreter Calling Line ID [Telephony] (see also: CID, ANI) Connectionless-mode Network Protocol Connectionless-mode Network Service Combined Line and Recording Circuit Layout Record Card Chartered Life Underwriter Color LookUp Table centimeters Command Module (Apollo spacecraft) [Space] Congregation of the Mission Communication Machinery Corp. Centralized Message Distribution Common Management Information Protocol Common Management Information Services Current Model Logic Cache/Memory Management Unit Complementary Metal Oxide Semiconductor (see MOS) Common Management Information Services and Protocol Over TCP/IP Common Mode Rejection Ratio Circuit Maintenance System Chief Master Sergeant Carnegie-Mellon University Cyan, Magenta, Yellow, blacK Canadian National [Corporate name, Railroading] Customer Name / Address [Telephony] Common Network Interface [Telephony, AT&T] (Department of AT&T) Cable News Network Carbon-Nitrogen-Oxygen [Space] Chief of Naval Operations Canadian National Railways Carrier to Noise Ratio Corporation for National Research Initiatives

CNRS Centre National de la Recherche Scientifique (French National Center for Scientific Research) CNS Central Nervous System CNSR Comet Nucleus Sample Return [Space] CO Cash Order CO Central Office [Telephony] CO Colorado CO Commanding Officer CO Conscientious Objector C/O in Care Of COB Close Of Business COBE COsmic Background Explorer [Space] COBOL COmmon Business Oriented Language COC Call of Cthulhu COCOT Customer Owned, Coin Operated Telephone [Telephony] COD Collect On Delivery; Cash On Delivery CODEC COder-DECoder COER Central Office Equipment Report COLA Cost-Of-Living Allowance COM Computer Output (on) Microfiche COM Computer Output (on) Microfilm COMAS Central Office Maintenance and Administration System COMM Communications COMPACT COMmercial Product ACquisition Team COMPTEL COMPton TELescope (on GRO) [Space] COMSAT Communications Satellite [Space] CONACYT Consejo Nacional de Cienca Y Tecnologia (Mexican National Council of Science and Technology) CONS Connection-Oriented Networking Service CONS Connection-Oriented Networking Session CONS CONStruct (LISP) CORE COntrolled Requirement Expression CORN COmputer Resource Nucleus COS Corporation for Open Systems COSINE Cooperation for Open Systems Interconnection Networking in Europe COSMIC COmmon System Main InterConnecting frame COSMIC COmputer Software Management and Information Center COSMOS COmputer System for Mainframe OperationS COSTAR Corrective Optics Space Telescope Axial Replacement [Space] COT Card Or Tape (NCR) CP Campus Police (MIT, others probably too) CP Canadian Pacific CP Chemically Pure CP Command Post CP Command Processor CP CoPy CP the Canadian Press CPA Certified Public Accountant CPE Customer Premises Equipment CPE Customer Provided Equipment CPFF Cost Plus Fixed Fee CPI Characters Per Inch CPI Common Programming Interface CPL Combined Programming Language CPM Control Program for Microcomputers (sometimes CP/M) CPM Control Program Monitor (sometimes CP/M)

CPO Chief Petty Officer CPO Chief Post Office CPR Canadian Pacific Railway CPS Characters Per Second CPSR Computer Professionals for Social Responsibility CPT CaPTain CPU Central Processing Unit CPW Certified Public Weigher CQ Change of Quarters CR Carriage Return (ASCII 15 octal) CRA Cambridge Redevelopment Authority CRAF Comet Rendezvous / Asteroid Flyby [Space] CRAM Card Random Access Memory (NCR, but maybe others) CRC Chemical Rubber Company CRC Cyclic Redundancy Check CREG Concentrated Range Extension with Gain CREN The Corporation for Research and Educational Networking (merge of BITNET and CSNet) CRRES Combined Release / Radiation Effects Satellite [Space] CRRES Combined Release and Radiation Effects Satellite [NASA] CRT Cathode Ray Tube (also generic reference to a terminal) CRTC Canadian Radio-television and Telecommunications Commission C&S Chivalry & Sorcery CS Civil Servant CS Computer Science; Computing Science CS County Seat CSA Confederate States of America CSAB Computing Sciences Accreditation Board CSACS Centralized Status, Alarm and Control System CSC Computer Sciences Corporation CSDC Circuit Switched Digital Capability CSF Critical Success Factor CSI Commercial Systems Integration CSIS Canadian Security and Intelligence Service CSL Coin Supervising Link CSM Command and Service Module (Apollo spacecraft) [Space] CSM Command Sergeant Major CSMA Carrier Sense Multiple Access CSMA/CA Carrier Sense Multiple Access with Collision Avoidance CSMA/CD Carrier Sense Multiple Access with Collision Detection CSNET Computer + Science Network (merged with BITNET to make CREN) CSO Central Services Organization CSOC Consolidated Space Operations Center (at Colorado Springs) CSP Control Switching Point CSR Control and Status Register CSR Customer Service Representative [Telephony] CSRG Computer Systems Research Group CSRS civil Service Retirement System CSS Customer Switching System CST Central Standard Time CSU Channel Service Unit CT Central Time C&T Communications & Tracking [Space] CT Connecticut CTC Canadian Transport Commission CTC Centralized Traffic Control [Railroading] CTD Computing and Telecommunications Division

CTIO Cerro Tololo Inter-american Observatory CTIO Cerro Tololo Interamerican Observatory [Space] CTNE Compania Telefonica Nacional de Espana CTS Clear To Send (EIA RS-232-C) CTS Compatible Timesharing System CTV Canadian TeleVision network CU Close-Up CUA Common User Access CUL See You Later [Net jargon] CV Curriculum Vitae CW Car Wars CW Chemical Warfare CW Child Welfare CW Churchwarden CW Churdwarden CW Continuous Wave CWO Cash With Order CWO Chief Warrant Officer CWRU Case Western Reserve University CXI Common X-windows Interface CY Calendar Year CYO Catholic Youth Organization CZ Canal Zone D Depth DA Days after Acceptance DA Department of Agriculture DA Deposit Account D/A Digital to Analog converter DA Directory Assistance (/C = computerized, /M = Microfilm) [Telephony] DA District Attorney DA Don't Answer [Telephony] (may be more general) DAC Digital to Analog Converter DA/C Directory Assistance/Computerized DACCS Digital Access Cross Connect System [Telephony] (suspect, see DACS) DACS Digital Access Cross-connect System [Telephony] DAD Draft ADdendum DAG Directed Acyclic Graph DAL Dedicated Access Line [Telephony] DA/M Directory Assistance/Microfilm DAP Division Advisory Panel (of NSF (q.v.) DNCRI (q.v.)) DAR Daughters of the American Revolution DARE Drug Abuse Resistance Education DARPA Defense Advanced Research Projects Agency (of the DoD, see also ARPA) DASD Direct Access Storage Device DAT Digital Audio Tape DATA Defense Air Transport Administration DAV Disabled American Veterans DB DataBase db decibel(s) dba doing business as DBF DBase Format DBME DataBase Managment Environment dbms DataBase Management System (rdbms for Relational ...) DBRAD Data Base Relational Application Directory

DC Direct Current (dc, see also AC) DC District of Columbia DCA Defense Communications Agency DCA Distributed Communication Architecture DCA Document Content Architecture DCC Descriptive Cataloging Committee DCCO Defense Commercial Communications Office DCD Data Carrier Detect (sometimes CD (q.v.)) (EIA RS-232-C) DCE Data Communication Equipment DCL Digital Command Language DCP Distributed Communications Processor DCTS Dimension Custom Telephone Service DD Daredevils DD Data Dictionary DD Days after Date DD Demand Draft DD Dishonorable Discharge DD Disk Drive DD Doctor of Divinity D&D Dungeons & Dragons DDC Digital Data Converter DDCU DC-to-DC Converter Unit [Space] DDD Direct Distance Dialing [Telephony] (principally US, elsewhere STD) DDL Document Description Language DDN Defense Data Network DDP Distributed Data Processing DDS Dataphone Digital Service [AT&T] DDS Digital Data Service DDS Direct Digital Service DDS Doctor of Dental Science DDS Doctor of Dental Surgery DDT DEC Debugging Tape DDT Di-<something> (pesticide) DDT Dynamic Debugging Technique DE Delaware DEA Drug Enforcement Agency [US Government] DEAR Department of Energy Acquisition Regulation DEC Digital Equipment Corporation [Corporate name] DECUS Digital Equipment Corporation Users Society DES Data Encryption Standard [NIST] DEW Distant Early Warning (as in DEW Line) DF Damage Free D/F Direction Finding DFC Distinguished Flying Cross DFD Data Flow Diagram DFE Data Flow Editor DFM Distinguished Flying Medal DFN Deutsche Forschungsnetz Verein (German Research Network Association) DFRF Dryden Flight Research Facility [Space] DFS Depth-First Search DFW Dallas-Ft.Worth (regional airport) DG Data General [Corporate name] DG Dei Gratia (by the grace of God) DG Director General DGSC Defense General Supply Center

DHHS Department of Health and Human Services DHSS british Department of Health and Social Security DHSS Department of Health and Social Security (British) DIA Document Interchange Architecture DIAD (magnetic) Drum Information Assembler / Dispatcher DIAL Direct Information Access Line DIAS Defense Automatic Integrated System DID Direct Inward Dialing [Telephony] DIF Document Interchange Format DIN Deutsches Institut fur Normung DIRE Dire Is Really Emacs DIS Draft International Standard [ISO] DISA Data Interchange Standards Association DISOSS Distributed Office Support System [IBM] DIY Do It Yourself DJ Disc Jockey DLA Defense Logistics Agency DLI Data Link Interface(?) DLL Data Link Layer [ISO OSI] DLL Dial Long Line equipment DLO Dead Letter Office DM Dungeon Master DMA Direct Memory Access DMD Doctor of Dental Medicine DME Distance Measuring Equipment DMF Probably part of an X.400 address in Europe DMOS Diffusion Metal Oxide Semiconductor (see MOS) DMSP Defense Meteorological Satellite Program [Space] DMV Department of Motor Vehicles DMV Department of Motor Vehicles (Calif) DMZ DeMilitarized Zone DNA DeoxyriboNucleic Acid DNA Digital Network Architecture [DEC] DNCRI [NSF] (q.v.) Division of Networking and Communications Research and Infrastructure DNHR Dynamic NonHierarchical Routing DNIC Data Network Identification Code [Telephony] DNIS Dialed Number Identification Service (see also DID) [Telephony] DNL Director of Naval Laboratories DNR Dialed Number Recorder [Telephony] DNS Domain Name System DOA Dead On Arrival DOB Date Of Birth DOC Dynamic Overload Control DOD Department Of Defense [US Government] (sometimes DoD) DOE Department of Energy [US Government] DOHC Dual OverHead Cams [Automotive] DOMAIN Distributed Operating Multi Access Interactive Network (Apollo) DOS Disk Operating System DOT Department Of Transportation [US Government] DOT&E Director, Operational Test and Evaluation DOV Data Over Voice [Telephony] DOY Day of Year DP Data Processing DP Dial Pulse [Telephony] DP Displaced Persons (expelled from native land) DP Display Postscript

DP DP DP DPA DPANS DPI DPS DQ DQ DQDB DQL DR DR DRAM DRD DRE DRG DRI DRI d.s. DS DS DSA DSE DSEE DSM DSO DSP DSP DSRI DSS DSS DST DSTN DSU DT DTE DTF DTMF DTP DTR DUI DUT DV DVM DVM DWAPS DWI DWI DWIM DX DXT d.y. E E EADASS EAFB

Double Penetration Double Play Draft Proposal Delegation of Procurement Authority Draft Proposed American National Standard Dots Per Inch Display PostScript Dairy Queen Dragon Quest Distributed Queue Dual Bus (IEEE 802.6) [Telephony, Networking] Database Query Language Dead Reckoning Dining Room Dynamic Random Access Memory (as opposed to static RAM) Data Reading Device Directional Reservation Equipment Democratic Republic of Germany (East Germany) Defense Research Internet Digital Research, Incorporated [Corporate name] died single [Genealogy] Double-Sided Draft Standard Dial System Assistance Data Structure Editor Domain Software Engineering Environment Distinguished Service Medal Distinguished Service Order Decessit Sine Prole (died without issue) Digital Signal Processing Digital Standard Relational Interface Decision Support System Direct Station Selection [Telephony] Daylight Saving Time Double SuperTwisted Nematic Digital Service Unit Delirium Tremens Data Terminal Equipment Dial Tone First payphone [Telephony] Dial Tone Multi Frequency [Telephony] DeskTop Publishing Data Terminal Ready (EIA RS-232-C) Driving Under the Influence Device Under Test Deo Vo lente (God willing) Digital Volt Meter Doctor of Veterinary Medicine Defense Warehousing Automated Processing System Died Without Issue [Genealogy] Driving While Intoxicated Do What I Mean Distance (as in long distance radio communication) Data eXtractT facility died young [Genealogy] East Espionage Engineering and Administrative Data AcquiSition System Edwards Air Force Base [Space]

EAN EARN EAS EASI EBCDIC EC ECAFE ECASS ECASS ECC ECC ECCM ECDO ECG ECL ECLSS ECM ECM ECMA ECO ECO ECO ECPA ECS ECT ECV ED&D EDGAR EDI EDIF EDO EDP EDS EDT EDTA EDTCC EE EE EEC EEC EEG EEL E&EO EEPROM EFF e.g. EGA EGP EGRET EHF EIA EINE EISA EISS EKG EL ELF

Certainly part of an X.400 Address in Europe European Academic Research Network Extended Area Service (or Engineering Admin. System) European Academic Supercomputer Initiative (of IBM) Extended Binary Coded Decimal Interchange Code Exchange Carrier [Telephony] Economic Commission for Africa and the Far East Electronically Controlled Automatic Switching System Export Control Automated Support System Error Correction Code Error Correction Code (corrects error in memory or transmission) Electronic Counter-CounterMeasures Electronic Community Dial Office ElectroCardioGram Emitter Coupled Logic (see also TTL) Environmental Control and Life Support System [Space] Electronic Counter Measure European Common Market European Computer Manufacturers Association Ecological Electronic Central Office Engineering Change Order Electronic Communications Privacy Act [US law] Environmental Control System [Space] ElectroConvulsive Therapy Electric Cargo Vehicle [NASA OEXP] Expert Dungeons & Dragons Electronic Data Gathering, Analysis, and Retrieval Electronic Data Interchange Electronic Design Interchange Format Extended Duration Orbiter [Space] Electronic Data Processing Electronic Data Systems Eastern Daylight Time Ethylene Diamine Tetraacetic Acid Electronic Data Transmission Communications Central Electrical Engineer Electrical or Electronics Engineer European Economic Community European Economic Comunity ElectroEncephaloGram Epsilon Extension Language Errors and Omissions Excepted Electrically Erasable Programmable Read Only Memory Electronic Frontier Foundation ??? (Latin(?): for example) Enhanced Graphics Adapter Exterior Gateway Protocol [Internet] Energetic Gamma Ray Experiment Telescope (on GRO) [Space] Extremely High Frequency (30-300GHz) Electronic Industries Association EINE Is Not Emacs Extended Industry-Standard Architecture European Intelligence Support System ElectroKardioGramm (see ECG) ElectroLuminescent (as in display) Extremely Low Frequency

ELO ELP ELV E&M system EM EMA EMACS EMACS E-MAIL EMF EMF EMI EMP EMPRESS EMR EMR EMS EMS EMT EMU EMU ENIAC ENS EO EO EOF EOM EOS EOWG EP EP EPA EPOS EPRI EPROM EPS EPT EQ ER ERA ERA ERA ERD ERE ERT ES ESA ESA ESAC ESDI ESE ESF ESM ESnet ESO ESO

Electric Light Orchestra Emerson, Lake and Palmer (or Powell) Expendable Launch Vehicle [Space] ``Ear and Mouth''; receive and transmit leads of a signalling Enlisted Man (see EW) Electronic Mail Association Editor MACroS Eight Megabytes And Constantly Swapping Electronic MAIL ElectroMotive Force ElectroMotive Force (voltage) ElectroMagnetic Interference Electromagnetic Pulse EnvironMental Pulse Radiation Environment Simulator for Ships ElectroMagetic Response ElectroMagnetic Response Electronic Message System Extended Memory Specification Emergency Medical Technician ElectroMagnetic Unit Extravehicular Mobility Unit [Space] Electronic Numerical Integrator and Calculator ENSign End Office [Telephony] Erasable Optical End Of File End Of Month Earth Observing System [Space] Engineering and Operations Working Group (under FNC) Experience Points Extended Play Environmental Protection Agency Engineering and Project-management Oriented Support system Electric Power Research Institute Erasable Programmable Read Only Memory Encapsulated PostScript Empire of the Petal Throne Educational Quotient (see IQ) Emergency Room Earned Run Average Entity-Relationship-Attribute Equal Rights Amendment Entity-Relation Diagram Entity Relationship Editor Earth Resources Technology [Space] Expert System European Space Agency European Space Agency [Space] Electronic Systems Assistance Center Enhanced Standard Device Interface East South East Extended Superframe Format [Telephony] Electronic Support Measures Energy Sciences network (DoE) [Networking] European Southern Observatory European Southern Observatory [Space]

ESP Extra Sensory Perception ESPS Entropic Signal Processing System ESS Electronic Switching System [Telephony] ESSEX Experimental Solid State EXchange EST Eastern Standard Time ET Eastern Time ET Extra Terrestrial [Space] ET (Shuttle) External Tank [Space] ETA Estimated Time of Arrival ET/ACC External Tank/Aft Cargo Carrier (see also ET) [Space] ETC Et cetera, and so on... ETD Estimated Time of Departure ETFD Electronic Toll Fraud Device [Telephony] ETH Eidgn\:oessiche Technische Hochschule (Swiss Federal Institute of Technology) ETLA Extended Three Letter Acronym [Space] ETO Earth-to-Orbit [Space] ETR Eastern Test Range [Space] ETS Electronic Translator System ETV Education TeleVision EUUG European Unix User Group EUV Extreme UltraViolet EUV Extreme UltraViolet [Space] EUVE Extreme UltraViolet Explorer [Space] EVA ExtraVehicular Activity EVA ExtraVehicular Activity [Space] EVX Electronic Voice eXchange EW Electronic Warfare EW Enlisted Woman (see EM) EWOS European Workshop for Open Systems FA Football Association (British soccer--a word derived from Association) FAA Federal Aviation Agency [US Government] FACD Foreign Area Customer Dialing FAO Food and Agriculture Organization [US Government] FAQ Frequently Asked Questions [Space] FAR Federal Acquisition Regulations FAS Foreign Agricultural Service FAS Free Alongside Ship FASST Flexible Architecture Standard System Technology FAST Fast Auroral SnapshoT explorer [Space] FAT Foreign Area Translation FAX FAcsimile FB Freight Bill FBI Federal Bureau of Investigation [US Government] FCC Federal Communications Commission [US Government] FCC Federal Computer Conference FCCSET Federal Coordinating Committee for Science, Education and Technology (under OSTP) {Maybe Eng. for Edu.??} FCO Field Change Order FCO Frequency Controlled Oscillator FCS Frame Check Sequence FDA Food and Drug Administration [US Government] FDDI Fiber Digital Data Interface FDDI Fiber Distributed Data Interface FDHD Floppy Drive High Density FDIC Federal Deposit Insurance Corporation

FDIC Federal Deposit Insurance Corporation [US Government] FDM Frequency Division Multiplexing FDR Franklin Delano Roosevelt [US President] FE Field Engineer (see also CE, SE) FEA Finite Element Analysis FEDSIM FEDeral Systems Integration and Management center FEMA Federal Emergency Management Agency FEMF Foreign EMF (q.v.) (a.k.a. Cross Battery) [Telephony] FEPC Fair Employment Practices Commission FEPG Federal Engineering Planning Group (of FNC under EOWG, originally of FRICC) FERS Federal Employees Retirement System FET Federal Excise Tax FET Field Effect Transistor FFA Future Farmers of America FFT Fast Fourier Transform FFT Fast Fourier Transform [Space] FG-A Feature Group A [Telephony] (Line Side termination for LD carriers) FG-B Feature Group B [Telephony] (Trunk Side termination for LD carriers (aka ENFIA B), 950 service) FG-D Feature Group D [Telephony] (Trunk Side termination for LD carriers, 1+ service) FGS Fine Guidance Sensors (on HST) [Space] FHA Federal Home Administration FHA Future Homemakers of America FIB Focused Ion Beam FICA Federal Insurance Contributions Act FIDO Fog Investigation Dispersal Operation FIFO First In First Out (as in registers and buffers) FILO First In Last Out (see also FIFO) FIMS Forms Interface Management System FINE FINE Is Not Emacs FIO Frequency In and Out FIPS Federal Information Processing Standard FIR Far InfraRed [Space] FIR Finite Impulse Response FIRMR Federal Information Resource Management Regulation FIT Federal Information Technologies, inc. FITS Flexible Image Transport System [Space] FIX Federal Inter-agency eXchange [Networking] FL Florida FLACC Full Level Algol Checkout Compiler FLEA Four Letter Extended Acronym FLL Fixed Loss Loop [Telephony] FLOP FLoating point OPeration FLOPS FLoating-point OPerations per Second FLRA Federal Labor Relations Authority FM Frequency Modulation FMB Federal Maritime Board FMCS Federal Mediation and Conciliation Service FMR Follow Me Roaming [Telephony] FMS Financial Management Service (Treasury Dept) [US Government] FMS Forms Management System FNC Federal Networking Council (formerly FRICC) [US Government] (under OSTP) FO Foreign Office

FO Forward Observer FOAC Federal Office Automation Center FOB Free On Board FOB Full Of Bull (aperiodical of) [TMRC] FOC Faint Object Camera (on HST) [Space] FOC Free Of Charge FOIA Freedom Of Information Act FOIMS Field Office Information Management System FOIRL Fiber Optic Inter(?) Repeater(?) Link(?) [Ethernet] FOOBAR See FUBAR [Net jargon] FOR Free On Rail FORCS Faa's Operational Reporting Communication System FORD Fix Or Repair Daily [Humor] FORD Found On Road Dead [Humor] FORTRAN FORmula TRANslator FOS Faint Object Spectrograph (on HST) [Space] FOSE Federal Office Systems Exposition FOT Fiber Optic Transceiver [Ethernet] FOT Free On Truck FOV Field Of View FPA Floating Point Accelerator FPC Fish Protein Concentrate FPE Floating Point Engine FPHA Federal Public Housing Authority FPLA Field Programmable Logic Array (see PLA) FPM Feet Per Minute FPO Field Post Office FPO Fleet Post Office fps Feet Per Second FPU Floating Point Unit FQDN Fully Qualified Domain Name [TCP/IP] (DNS) FR Frame Relay [Telephony, Networking] FRACTAL FRACTional dimensionAL FRED Fred Resembles Emacs Deliberately FRG Federal Republic of Germany (West Germany) FRICC Federal Research Internet Coordinating Committee (now FNC, q.v.) [Networking, US Government] FROG Free Rocket Over Ground FRPG Fantasy Role Playing Game FRS Federal Reserve System FS Field Service FS File System FS Full Standard FSF Free Software Foundation FSK Frequency Shift Keying FSLIC Federal Savings and Loan Insurance Corporation FSS Federal Supply Service FSW Forward Swept Wings Ft Foot FTAM File Transfer And Management (ISO upscale FTP) FTC Federal Trade Commission FTL Faster Than Light FTP File Transfer Protocol (esp. of the TCP/IP suite) FTS Federal Telecommunications System [Telephony, US Government] FTS Flight Telerobotic Servicer [Space] FUBAR F***ed Up Beyond All Recognition/Repair FUBAR Fouled Up Beyond All Recognition/Repair

FUSE FW FWD FWHM FX FY FYI G G GA GA GA GA GA GAAP GAB Gaia ancient GAN GAO GAR GARR Network GAS GATT GAW GAW GB GB GB GBIP GBT GC GC GCA GCC GCD GCL GCM GCR GCT GCVS GDB GDP GDS GE GEM GEM GEO GHQ GHRS GHz GI GI GI GI GID

Far Ultraviolet Spectroscopic Explorer [Space] Fringeworthy Front Wheel Drive Full Width at Half Maximum [Space] Foriegn eXchange [Telephony] Fiscal Year For Your Information General audiences [Movie rating] Gravity Gamblers Anonymous General Assembly General Average General of the Army Georgia Generally Accepted Accounting Principles Group Audio Bridging [Telephony] Earth's self-sustaining Biosphere (Not an acronym, from some language, I think) Global Area Network General Accounting Office [US Government] Grand Army of the Republic Gruppo Arminizzazione Rete por la Ricerca (Italian Research Harmonization Group) Get-Away Special [Space] General Agreement on Tariffs and Trade Guaranteed Annual Wage Guarenteed Annual Wage Gangbusters GigaByte Great Britain General Purpose Interface Bus Green Bank Telescope [Space] Garbage Collection (LISP) Gas Chromatograph (or Chromatography) Ground Controlled Approach Gnu C Compiler Ground Controlled Descent Graphics Command Language General Court Martial Group-Coded Recording (magnetic tape, 6250 bpi) Greenwich Civil Time General Catalog of Variable Stars [Space] Gnu DeBugger Gross Domestic Product Great Dark Spot [Space] General Electric Giotto Extended Mission [Space] Graphics Environment Manager Geosynchronous Earth Orbit [Space] General HeadQuarters Goddard High Resolution Spectrograph (on HST) [Space] Giga HertZ (unit of frequency, 1,000,000,000 cycles per second) Galvanized Iron Gastro Intestinal (as in upper GI) General Issue Government Issue Group ID [UNIX]

GIF Graphics Interchange Format GIGO Garbage In Garbage Out GIN Graphics INput GISS Goddard Institute for Space Studies GKS Graphical Kernel Standard GKS Graphics Kernel System GM Game Master GM General Manager GM General Motors [Corporate name, Automobile] GM Guided Missile GMBH Gesellschaft Mit Beschraenkter Haftung GMC Giant Molecular Cloud [Space] GMD Gesellschaft f\:ur Mathematik und Datenverarbeitung (German Institute for Mathematics and Data Processing) GMRT Giant Meter-wave Radio Telescope [Space] GMT Greenwich Mean Time (also called UT) GNP Gross National Product GNU GNU's Not Unix GOES Geostationary Orbiting Environmental Satellite [Space] GOES Geostationary Orbiting Environmental Satellites [Space] GOSIP Government Open Systems Interconnection Profile (calls for government procurement of ISO/CCITT products) GOSIP Government OSI Profile GP General Practitioner GP General Purpose (RR engines and origin of Jeep) [Railroading, Automobile] GPC General Purpose Computer [Space] GPI Graphics Programming Interface GPIB General Purpose Interface Bus GPIB General-Purpose Interface Bus GPL GNU General Public Licence GPO General Post Office GPO Government Printing Office GPS Global Positioning System GPS Global Positioning System [Space] GQ General Quarters GRB Gamma Ray Burst(er) GREP Global Regular Expression Print, g/re/p, (UNIX command) GREP Global Regular Expression Print [UNIX] GRO Gamma Ray Observatory [Space] GRS Gamma Ray Spectrometer (on Mars Observer) [Space] GRS Great Red Spot [Space] GS General Schedule GS Glide Slope GSA General Services Administration GSA General Services Adminstration [US Government] GSA Girl Scouts of America GSBCA General Services administration Board of Contract Appeals GSC Guide Star Catalog (for HST) [Space] GSFC Goddard Space Flight Center (Greenbelt, MD) [NASA, Space] GSI Gesellschaft f\:ur Schwerionenforschung (German Federal Research Institute for Heavy Ion Research) GSM Global System Mobile GSM Groupe Speciale Mobile (Committee Designing preceding) GSTS Ground-based Surveillance and Tracking System GT Gross Ton GTE General Telephone and Electric [Corporate name]

GTO GTSI GUI GW GWEN GWM H H HACD HAL HAM HAO Hb HBM HBO HC HC HCFA HCFC HCL HD HD HD HDA HDBV HDL HDLC HDTV HE HE HEAO HEDM HEMP HEO HEPnet HERO HF HF HFE HFS HGA HHS HI HIIPS HLC HLL HLV HMC HMOS HMS HMT HNPA HOBIS HOL HOTOL HP HP

Geostationary Transfer Orbit [Space] Government Technology Services, inc. Graphical User Interface Gamma World Ground Wave Emergency Network Generic Window Manager [X] Harn Height Home Area Customer Dialing Heuristically programmed ALgorithmic computer (movie 2001) Hold And Modify High Altitude Observatory [Space] HemogloBin Her British Majesty; His British Majesty Home Box Office Holy Communion House of Commons Health Care Financing Administration hydrochlorofluorocarbon [Chemical] High Cost of Living Hard Disk Heavy Duty Henry Draper catalog entry [Space] Head Disk Assembly (in winchester disk drives) Host Data Base View High Density Lipoprotein High-level Data Link Control [Networking] High Definition Television His Eminence His Excellency High Energy Astronomical Observatory [Space] High Energy-Density Matter [Space] Help End Marijuana Prohibition High Earth Orbit [Space] High Energy Physics network [Networking] Hazards of Electromagnetic Radiation to Ordnance High Fantasy High Frequency (3-30MHz) Human Factors Engineering Hierarchical File System High Gain Antenna [Space] (US Department of) Health and Human Services Hawaii Hud Integrated Information Processing Services Heavy Lift Capability [Space] High-Level Language Heavy Lift Vehicle [Space] Halley Multicolor Camera (on Giotto) [Space] High performance Metal Oxide Semiconductor (see MOS) His/Her Majesty's Ship His/Her Majesty's Transport Home Numbering Plan Area [Telephony] HOtel Billing Information System High-Order System HOrizontal Take-Off and Landing Hewlett Packard, Inc. [Corporate name] High Pressure

HP HP HP HPGe HPL/T HQ HR HR HRH HRH HRI HS HSB HSP HST HST HT HTK HUAC HUD HUD HUPD HUT HV HVAC HW2000 HWM Hz IAB IAEA IANA IATA IAU IAUC IBM IBM IBM IBT IC IC ICB ICBM ICE ICE ICI ICJ ICL ICMP ICP ICP ICRC ID ID IDA IDA IDA IDDD

Higher Power (sort of an AA "in" term, usually God) Hit Points HorsePower High Purity Germanium High-Productivity Languages/Tools HeadQuarters Hertzsprung-Russell (diagram) [Space] House of Representatives Her Royal Highness His Royal Highness High Resolution Imager (on ROSAT) [Space] High School Hue, Saturation, Brightness High Speed Photometer (on HST) [Space] Hawaiian Standard Time Hubble Space Telescope [Space] High Tension (as in electric power transmission) Hits To Kill House Unamerican Activities Committee Heads Up Display Housing and Urban Development [US Government] Harvard University Police Department Hopkins Ultraviolet Telescope (ASTRO package) [Space] High Voltage Heating, Ventilation, and Air Conditioning Highway 2000 High-Water Mark HertZ (unit of frequency, cycles per second) Internet Activities Board [Networking] International Atomic Energy Agency Internet Assigned Numbers Authority ([email protected]) International Air Transport Association International Astronomical Union [Space] IAU Circular [Space] Ingrained Batch Mentality International Business Machines, Inc. [Corporate name] Itty Bitty Machines Illinois Bell Telephone Integrated Circuit Interexchange Carrier [Telephony] (see also IEC, IXC) Interstate Computer Bank InterContinental Ballistic Missile In-Circuit Emulator International Cometary Explorer [Space] Imperial Chemical Industries International Court of Justice International Computers Ltd. Internet Control Message Protocol Integrated Channel Processor Inventory Control Points International Cosmic Ray Conference Idaho IDentification Intercommunication Data Areas International Dark-sky Association [Space] International Development Association International Direct Distance Dial [Telephony]

IDE Interactive Development Environments, inc IDF Intermediate Distributing Frame [Telephony] IDL Interactive Data Language [Space] IDV Interlibrational Derived Vehicle [Space] i.e. ???? (Latin(?): in other words (?)) IE Indo-European IEC Inter-Exchange Carrier [Telephony] (see also IC, IXC) IEE Institute of Electrical Engineers [UK] IEEE Institute of Electrical and Electronic Engineers IETF Internet Engineering Task Force IF Intermediate Frequency (as in IF stage) IFB Invitation For Bids IFC International Finance Corporation IFC International Freighting Corporation IFF Identification - Friend or Foe IFF Interchange File Format IFLA International Federation of Library Associations IFR Instrument Flight Rules [Aviation] IGES Initial Graphics Exchange Standard IGM InterGalactic Medium [Space] IGY International Geophysical Year IGY International Geophysical Year [Space] IHP Indicated HorsePower IHS Integrated Hospital Support IIA Information Industry Association IIE Institute of Industrial Engineers IIHF International Ice Hockey Federation IIL Integrated Injection Logic ILO International Labor Organization ILS Instrument Landing System ILV Industrial Launch Vehicle [Space] IMF International Monetary Fund IMHO In My Humble Opinion [Net jargon] IMO In My Opinion [Net jargon] IMP Interface Message Processor [ARPANET/MILNET] (replaced by PSN) IMSL International Mathematical Subroutine Library IN Indiana INADS INitialization and ADministration System [Telephony] INRA Iesus Nazerenus Rex Iudaeorum (Jesus of Nazareth, King of the Jews) INRIA Institut National de Recherche en Informatique et Automatique INS Immigration and Naturalization Service INTAP INteroperability Technology Association for information Processing INWATS INward Wide Area Telephone Service [Telephony] I/O Input/Output IO Input/Output (sometimes I/O) IOC International Operating Center [Telephony, US] IOD Identified Outward Dialing IOOF International Order of Odd Fellows IOTA Infrared-Optical Telescope Array [Space] IOTA International Occultation Timing Association [Space] IOU I Owe you(U) IP Information Provider [Telephony] IP Innings Pitched IP Intermediate Point IP Internet Protocol

IPC IPE IPMS IPS IPS IPSE IQ IR IR IRA IRA IRAF IRAS IRBM IRDS IRDS IRE see) IRM IRMS IRS IRTF IS IS ISA ISAM ISAS ISBD ISC ISC ISCH ISDN ISDT ISEE ISF ISFUG ISI ISM ISO ISO ISO ISODE ISOO ISPM ISPM ISR ISRG ISV ISY IT IT ITC ITS ITT ITU ITUSA IUE

Inter-Process Communication Integrated Programming Environment InterPersonal Message Services Inertial Pointing System [Space] Information Processing Standards Integrated Project-Support Environment Intelligence Quotient (see EQ) Index Register Infra-Red Individual Retirement Account Irish Republican Army Image Reduction and Analysis Facility [Space] InfraRed Astronomical Satellite [Space] Intermediate Range Ballistic Missile Information Resource Dictionary Standard InfraRed Detection Set Institute of Radio Engineers (old name for the now IEEE, which Information Resources Management Information Resources Management Service Internal Revenue Service Internet Research Task Force Information Systems International Standard [ISO] (Beyond the DIS Stage) Industry-Standard Architecture Indexed Sequential Access Method Institute of Space and Astronautical Science (Japan) [Space] International Bibliographic Description Information Services Center International Switching Center Interstitial-Cell-Stimulating Hormone (same as LH) Integrated Services Digital Network [Telephony] Integrated Systems Development Tool International Sun Earth Explorer (usually ISEE-3) Information Systems Factory Integrated Software Federal User Group Information Sciences Institute InterStellar Medium [Space] Infrared Space Observatory [Space] International Organization for Standardization International Standards Organization [Space] ISO Development Environment Information Security Oversight Office International Solar Polar Mission International Solar Polar Mission (now Ulysses) [Space] Institute of Snow Research Independent Space Research Group Independent Software Vendor International Space Year [Space] Industrial Technology Information Technology Inter-Task Communication Incompatible Timesharing System International Telephone and Telegraph International Telecommunications Union IT Users Standards Association International Ultraviolet Explorer [Space]

IUS Inertial Upper Stage IUS Inertial Upper Stage [Space] IUV Interlibrational Utility Vehicle [Space] IXC Inter-eXchange Carrier [Telephony] (see also IC, IEC) IXI International (pan-European) X.25 Infrastructure JACM Journal of the Association for Computing Machinery JANET Joint Academic Network (UK) JBS John Birch Society JC Jesus Christ JC Joint Compound (plumbing) JC Julius Caesar JC Junior College JCA Jewelry Crafts Association JCAC Joint Civil Affairs Committee JCAE Joint Committee on Atomic Energy JCEE Joint Council on Economic Education JCET Joint Council on Educational Television JCS Joint Chiefs of Staff JD Justice Department JDS John Dewey Society JEM Japanese Experiment Module (for SSF) [Space] JES John Ericsson Society JET Joint European Torus (fusion research) JFK John F. Kennedy JFK John F. Kennedy (international airport) JFMIP Joint Financial Management Improvement Program JGR Journal of Geophysical Research JGR Journal of Geophysical Research [Space] JI Justice, Inc. JIC Joint Intelligence Center JIC Just in Case JILA Joint Institute for Laboratory Astrophysics [Space] JIM Job Information Memorandum JINTACCS Joint INteroperability of TActical Command and Control Systems JIS Japan Industrial Standards JISC Japanese Industrial Standards Committee JIT Just In Time JMS John Milton Society JNT Joint Network Team (UK) JO Job Order JO Junior Officer JOVE Jonathan's Own Version of Emacs JOVIAL Jules Own Version of the International Algorithmic Language JPL Jet Propulsion Laboratory JPL Jet Propulsion Laboratory [Space] JRC Junior Red Cross JSC Johnson Space Center JSC Johnson Space Center (NASA) [Space] JSD Jackson System Development JSRC Joint Services Review Committee JTIDS Joint Tactical Information Distribution Systems JV Junior Varsity JvNC John von Neumann (Super Computer) Center JvNCnet John von Neumann (Super Computer) Center network K Kilo- (metric 1000) K9 canine (K9 corps - army dogs)

KAIST KAO KB KC KC KD KD KDCI KERMIT KET KHz KI KIA KIAS Km KO KP KP KPNO KPO KQC K&R KS KSC KSU KTB KTS KTU KWIC KY L1 L2 L3 L4 L5 LA LA LA LADAR LAM LAMA LAN LAN LANL LANL LAPB LAPD LAPD LAR LaRC LASER LAT LATA LAX LB LB LBHS

Korean Advanced Institute of Science and Technology Kuiper Airborne Observatory [Space] KiloByte King's Counsel (QC when queen reigning) Knights of Columbus Kiln Dried Knocked Down Key Display Call Indicator Kl-10 Error-free Reciprocal Micro Interconnect over Tty lines Kentucky Educational Television Kilo HertZ (unit of frequency, 1000 cycles per second) Kiwanis International Killed In Action Knot Indicated Air Speed Kilometers Knock Out [Boxing, Electric] Key Pulse [Telephony] Kitchen Police Kitt Peak National Observatory KeyPunch Operator King's College London Kernighan and Ritchie, the c programming language King's Scholar Kennedy Space Center (NASA) [Space] Key System Unit [Telephony] Cretaceous-Tertiary Boundary (from German) [Space] Key Telephone System [Telephony] Key Telephone Unit [Telephony] Key Word In Context Kentucky Lagrange Point #1 35,000 Miles above moon [Space] Lagrange Point #2 40,000 Miles behind moon [Space] Lagrange Point #3 (?? 35,000 Miles below moon) [Space] Lagrange Point #4 240,000 mile Earth orbit [Space] Lagrange Point #5 240,000 mile Earth orbit [Space] Los Angeles Louisiana Low Altitude LAser Detection And Ranging Master of Liberal Arts Local Automatic Message Accounting [Telephony] Local Apparent Noon Local Area Network Los Alamos National Laboratory [Space] Los Alamos (NM) National Laboratory Link Access Procedure (Balanced) Link Access Procedure (??) Los Angeles (CA, US) Police Department Local Acquisition Radar Langley Research Center (NASA) [Space] Light Amplification by Stimulated Emission of Radiation Local Apparent Time Local Access and Transport Area [Telephony] Los Angeles International Airport Light Bomber pound (LiBra) Long Beach High School

LBL Lawrence Berkeley (Calif.) Labs LBS Pounds LC inductor-Capacitor circuit (as in filters, L is symbol inductance) LCD Liquid Crystal Display LCD Lowest Common Denominator LCDR Lieutenant Commander LCL Less than Carload Lot [Railroading] LCL Lunar Cargo Lander [NASA OEXP] LCM Least Common Multiple LCM Life Cycle Management LCS Laboratory for Computer Science (of MIT) LCT Landing Craft Tanks LD Long Distance [Telephony] LDC Long Distance Carrier [Telephony] LDEF Long Duration Exposure Facility [Space, NASA] LDF Large Deployable Reflector [Space] LDL Low Density Lipoprotein LDX Long Distance eXtender [Telephony] LEAP Low-power Enhanced At Portable LEC Local Exchange Carrier [Telephony] LED Light Emitting Diode LEM Lunar Excursion Module (a.k.a. LM) (Apollo spacecraft) [Space] LEO Low Earth Orbit [Space] LEP Large Electron-Positron collider [CERN] LeRC Lewis Research Center (NASA) [Space] LEST Large Earth-based Solar Telescope [Space] LF Low Frequency (30-300KHz) LFSA List of Frequently Seen Acronyms (!) [Space] LGA Low Gain Antenna [Space] LGM Little Green Men [Space] LH Left Hand LH Liquid Hydrogen (also LH2 or LHX) [Space] LH Lower Half LH Luteinizing Hormone (same as ISCH) LHC Large Hadron Collider [CERN] LHD Litterarum Humaniorum Doctor (doctor of human letters) LHS Left Hand Side LI Long Island LIFIA Laboratoire d'Informatique Fondamentale et d'Intelligence Artificielle LIFO Last In First Out (see FIFO) LINC Laboratory INstrument Computer LISA Large Installation Systems Administration (USENIX specific?) LISP LISt Processing Language LIU Line Interface Unit LL Late Latin LL Long Lines [Telephony] LLB Legum Baccalaureus (bachelor of laws) LLD Legum doctor (doctor of laws) LLN Line Link Network [Telephony] LLNL Lawrence Livermore National Laboratories LLO Low Lunar Orbit [Space] LLOX Lunar Liquid Oxygen [Space] LLP Line Link Pulsing [Telephony] LM Life Master (Contract Bridge ranking) LM Lunar Module (a.k.a. LEM) (Apollo spacecraft) [Space]

LMC LMC LMOS LN2 LNG LOA LOFT LOOPS LOP LOSF LOTS LOX LOX LP LP LPC LPDA LPF LPG LPG LPL LPN LPP LPR LPT LPV LRB LRBM LRC LRU LRU LRV LS LS LS LSAP LSB LSB LSC LSC LSD LSD LSD LSI LSP LSR LSS LSS LSSD LT LT LTC LTJG LTL LTP LUG LUT

Large Magellanic Cloud (see SMC) Large Magellanic Cloud [Space] Line Maintenance Operations System [Telephony, AT&T] Liquid N2 (Nitrogen) [Space] Liquified Natural Gas Lands of Adventure Launch Operations Flight Test [Space] Lisp Object Oriented Programming System Lines Of Position Lunar Orbit Staging Facility [Space] Low Overhead Timesharing System Liquid Oxygen Liquid OXygen [Space] Long Play(ing) (record) Low Pressure Linear Predictive Coding (speech processing) Link Problem Determination Aid League for Programming Freedom Liquefied Petroleum Gas Low Pressure Gas Lunar Personnel Lander [NASA OEXP] Licensed Practical Nurse Licensed Program Products Line PrinteR Lunar Propellant Tanker [NASA OEXP] Lunar Piloted Vehicle [NASA OEXP] Liquid Rocket Booster [Space] Long Range Ballistic Missile Longitudinal Redundancy Character Least Recently Used Line Replaceable Unit Light Rail Vehicle [Railroading] Left Side Letter Signed Locus Sigilli (place of seal) Logical(?, maybe Link) Service Access Point [OSI, Networking] Least Significant Bit; Least Significant Byte Lower Side Band Lecture Series Committee (of MIT) LightSpeed C Least Significant Digit LySergic acid Diethylamide pounds (Libra), shillings (Sestertii), and (old) pence (Denarii) Large Scale Integration LightSpeed Pascal Local Standard of Rest [Space] Life Support System Loop Switching System Level-Sensitive Scan Detection Long Ton Low Tension Lieutenant Colonel Lieutenant Junior Grade Less than Truckload Lot Lunar Transient Phenomenon [Space] Local Users Group Look-Up Table

LWM Low-Water Mark LWT London Weekend Television [Corporate name] LZ Landing Zone M Mega- (metric 10^6) m meter(s) m milli- (metric 1/1000) M Miniatures MA Massachusetts [US state postal designation] MAAP Maintenance And Administration Panel MAC an MIT interdepartmental lab (stands for many things) (renamed to LCS) MAC Media Access Control MAC Medium Access Control MAC Military Air Command MACSYMA project MAC's SYmbolic MAnipulation System MAD Mutual Assured Destruction MADD Mothers Against Drunk Driving MAG Magazine MAN Metropolitan Area Network MAP Manufacturing Automation Protocol MAP/TOP Manufacturing Automation Protocol/Technical Office Protocol MARBI MAchine Readable form of Bibliographic Information MARC MAchine Readable card Catalog MARS Multiuser Archival and Retrieval System MASC Multiple Award Schedule Contract MASER Microwave Amplification by Stimulated Emission of Radiation MASH Mobile Army Surgical Hospital MAST Multi-Application SOnar Trainer MAT-CALS Marine Air Traffic-Control And Landing System MAU Math Acceleration Unit MAU Media Access Unit MAU Medium Access Unit MB Manned Base [Space] MB MegaByte MBA Master Business Administration MBTA Massachusetts Bay Transportation Authority MC Master of Ceremonies MCA Micro Channel Architecture MCAE Mechanical Computer Aided Engineering MCC Master Control Console MCC Microelectronics and Computer technology Corporation MCC Mission Control Center [Space] MCP Master Control Program MCP/AS Master Control Program/Advanced System MCPO Master Chief Petty Officer MCSV Mars Crew Sortie Vehicle [NASA OEXP] MD Doctor of Medicine MD Maryland MD Maryland [US state postal designation] MD Medical Doctor MD Months after Date MDAS Magnetic Drum Auxiliary Sender MDC Metropolitan District Commision (Mass State Agency) MDE Modular Design Environment MDF Main Distribution Frame [Telephony] MDRE Mass Driver Reaction Engine [Space] MDT Mean Down Time

ME ME MECO MEd MERP MeV MF MF MF MFA MFA MFJ MFLOPS MFM MFS MG MG MG MGH MGM MHD MHS MHz MI MI MIA MIB MIDI MIFASS MILNET MIM MIMD MINCE MINE MIPS Mir MIRV MIS MIT ML mL MLA MLD MLL MLS MLS MLV MM mm MMES MMFS MMH MMM MMT MMU MMU MMW

Maine Mechanical Engineer Main Engine CutOff [Space, Shuttle] Master of EDucation Middle-Earth Role Playing Million Electron Volts Medium Frequency (300-3000KHz) Middle French Multi-Frequency [Telephony] Master Fine Arts Museum of Fine Arts [Boston] Modified Final Judgment [Telephony] Million FLoating-point OPerations per Second (see also FLOPS) Modified Frequency Modulation Macintosh File System Machine Gun Major General Military Government Massachusetts General Hospital Metro-Goldwyn Mayer [Corporate name] MagnetoHydroDynamics Mail Handling System [ISO] Mega HertZ (unit of frequency, 1,000,000 cycles per second) Michigan Military Intelligence Missing In Action Management Information Base Musical Instrument Digital Interface Marine Integrated Fire And Support System MILitary NETwork Morality In Media Multiple Instruction, Multiple Data MINCE Is Not Complete Emacs MINE Is Not Emacs (but it is mine) Million Instructions Per Second Peace [Russian] Multiple Independently-Targetable Reentry Vehicle Management Information System Massachusetts Institute of Technology Middle Latin milliliter(s) Member of Legislative Assembly (see MPP) Minimum Lethal Dose Mars Logistics Lander [NASA OEXP] Microwave Landing System Multi-Level Security Medium Lift Vehicle [NASA OEXP] Maryknoll Missioners millimeters Martin Marietta Energy Systems Manufacturing Message Format Standard MonoMethyl Hydrazine [Space] see 3M Multiple Mirror Telescope [Space] Manned Maneuvering Unit [Space] Memory Management Unit Multi-Mega Watt [Space]

MN MNA MNP MNRAS MO MO MO MO MO MOC MOD MOL MOLA MOMA MOMV MOR MOS MOSFET MOTAS MOTIS MOTIS MOTOS MOTSS MOTV MOU MOUSE MP MP MP MP MPC MPE MPG MPH MPP MPR MPV MPW MR MRI MRP MRSR MRSRM MS MS MS MS MS MSB MSC MSCP MSD MS-DOS MSE MSFC MSFC MSG

Minnesota Member of National Assembly (Quebec) Microcom Networking Protocol [Corporate name] Monthly Notices of the Royal Astronomical Society [Space] Mail Order Medical Officer Missouri Modus Operandi Money Order Mars Observer Camera (on Mars Observer) [Space] Ministry of Defence (UK) (sometimes written MoD) Manned Orbiting Laboratory [Space] Mars Observer Laser Altimeter (on Mars Observer) [Space] Museum of Modern Art [New York] Manned Orbital Maneuvering Vehicle [Space] Middle-Of-the-Road Metal Oxide Semiconductor Metal Oxide Semiconductor Field Effect Transistor Member Of The Appropriate Sex Member Of The Inappropriate Sex Message-Oriented Text Interchange System Member of the Opposite Sex Member of the Same Sex Manned Orbital Transfer Vehicle [Space] Memorandum Of Understanding Minimum Orbital Unmanned Satellite of Earth Melting Point Member of Parliament Metropolitan Police Military Police(man) Minor Planets Circular [Space] Mission to Planet Earth [Space] Miles Per Gallon Miles Per Hour Member of Provincial Parliament (Canada; also MLA) Mars Pressurized Rover [Space] Mars Piloted Vehicle [NASA OEXP] Macintosh Programmer's Workshop Miniatures Rules Magnetic Resonance Imaging Manufacturing Requirements Planning Mars Rover and Sample Return [Space] Mars Rover and Sample Return Mission [Space] ManuScript Master of Science Military Science Motor Ship Multiple Sclerosis Most Significant Bit; Most Significant Byte MicroSoft C Mass Storage Control Protocol Most Significant Digit MicroSoft DOS Mobile Subscriber Equipment (George C.) Marshall Space Flight Center (NASA) [Space] Marshall Space Flight Center MonoSodium Glutamate

MSH Marvel Super Heroes MSL Mean Sea Level MSPCA Massachussetts Society for the Prevention of Cruelty to Animals MSPE Mercenaries, Spies & Private Eyes MSRP Manufacturer's Suggested Retail Price MSS Management Support System MSS ManuScriptS MSS Mass Storage System MSS Maximum Segment Size [TCP/IP] (see also MTU) MST Mountain Standard Time MT Metric Ton MT Mountain Time MTA Message Transfer Agent MTA Metropolitan Transportation Authority MTBF Mean Time Between Failures MTC Man Tended Capability [Space] MTR Magnetic Tape Recording MTSO Mobile Telephone Switching Office [Telephony] MTTF Mean Time To Failure MTTR Mean Time To Recovery MTTR Mean Time To Repair MTU Maximum Transfer Unit [Networking] (see also MSS) MTV Music TeleVision MUF Maximum Usable Frequency (max freq during sunspot activity) MULTICS MULTiplex Information Computer Services MUMPS Mgh Utility MultiProgram System MUNG Mung Until No Good (see the hacker's dictionary) MUX MUltipleXor MVA MegaVolt Ampere MVS Multiple Virtual Storage [IBM] MX Missile eXperimental N North N Notice NA Narcotics Anonymous NA North America NA Not Applicable NAACP National Association for the Advancement of Colored People NAAS North American Automated Systems co. NAB National Association of Broadcasters NABISCO NAtional BIScuit COmpany [Corporate name] NACCIRN North American Coordinating Committee for Intercontinental Research Networking (see also CCIRN) NACS National Advisory Committee on Semiconductors NAD Network Access Device NADGE NATO Air Defense Ground Environment NAG Numerical Algorithms Group NAGE National Association of Government Employees NAK Negative AcKnowledge NAM Name and Address Module [Telephony] (cellular phone changeable ROM) NAM National Account Manager [Telephony, AT&T] NAM Number Assignment Module [Telephony] (cellular phone changeable ROM) NANP North American Numbering Plan NAPAP National Acid Precipitation Assessment Program NAR Nuclear Acoustic Resonance NARDAC NAvy Regional Data Automation Center

NAS NAS NASA NASDA NASM NASP NATO NAVDAC NAVSWC NB NB NBA NBC NBFM NBO NBS NBVM NC NC NC NCA NCC NCC NCDC NCE NCGA NCI NCIC NCO NCP NCR NCS NCSA NCSC NCTL NCV ND ND NDA NDDL NDE NDEA NDL NDP NDSL NDSL NDT NDV NDV NE NE NEAR NEARnet NEB NEC NEI NES

National Academy of Sciences National Advanced Systems National (US) Aeronautics and Space Administration [Space] NAtional (Japan) Space Development Agency [Space] National (US) Air and Space Museum [Space] National (US) AeroSpace Plane [Space] North Atlantic Treaty Organization NAVal Data Automation Command NAVal Surface Weapons Center New Brunswick Nota Bene National (US) Basketball Association National (US) Broadcasting Company [Corporate name] NarrowBand Frequency Modulation Network Build Out National Bureau of Standards (renamed NIST) [US Government] Narrow Band Voice Modulation No Charge No Connection North Carolina Network Control Analysis National (US) Computer Conference National (US) Council of Churches National (US) Climatic Data Center New Catholic Edition National (US) Computer Graphics Association National (US) Cancer Institute [US Government] National (US) Cartographic Information Center Non-Commissioned Officer Network Control Program National (US?) Cash Register [Corporate name] Network Computing System National (US) Center for Supercomputing Applications National (US) Computer Security Center [NSA] National Computer and Telecommunications Laboratory No Commercial Value No Date North Dakota Non-Disclosure Agreement Neutral Data Definition Language News Development Environment National (US) Defense Education Act Network Database Language New Democratic Party (Canada) National (US) Defense Student Loan National (US) Direct Student Loan Newfoundland Daylight Time NASP Derived Vehicle NASP Derived Vehicle [Space] New England North East National Electronic Accounting and Reporting system New England Academic and Research Network New English Bible Nippon Electric Company [Corporate name] Not Elsewhere Included National Energy Strategy

NES Not Elsewhere Specified NESC National Energy Software Center NET National (US) Educational Television NET NETwork NET New England Telephone NEWS Network extensible Window System NEXRAD NEXt generation weather RADar NF No Funds NFC National (US) Football Conference NFFE National (US) Federation of Federal Employees NFL National (US) Football League NFS Network File System NG National Guard NG No Good NGC New General Catalog [Space] NH New Hampshire NHI National Health Insurance NHL National (Canada) Hockey League NHLBI National Heart, Lung, and Blood Institute (Bethesda, MD) NIC Network Information Center ("The NIC" is NIC.DDN.MIL) NICMOS Near Infrared Camera / Multi Object Spectrometer (HST upgrade) [Space] NIFTP (a file transfer network in the UK) NIH National (US) Institutes of Health NIH Not Invented Here NIM Nuclear Instrumentation Module (an electronic instr. standard) NIMH National Institute of Mental Health (Rockville, MD) NIMS Near-Infrared Mapping Spectrometer (on Galileo) [Space] NIR Near InfraRed [Space] NIS Network Information System (formerly yp) NISO National Information Standards Organization NIST National Institute of Standards and Technology (formerly NBS) [US Government] NJ New Jersey NJB New Jersey Bell [Telephony] NL National League (baseball) NLM National Library of Medicine NLP Natural Language Processing NLRB National Labor Relations Board NLS Network License Server NM Nautical Mile NM New Mexico NM Night Message NM No Mark; Not Marked NMOS N channel Metal Oxide Semiconductor (N-MOS) (see MOS) NMR Nuclear Magnetic Resonance NMS Network Monitoring Station NNE North North East NNTP Net News Transfer Protocol NNW North North West NNX NANP syntax for a three-digit string, N:{2-9}, X:{0-9} [Telephony] NOA NSWC Office Automation NOAA National Oceanic and Atmospheric Administration [Space, US Government] NOAO National (Tucson, AZ, US) Optical Astronomical Observatories [Space]

NOC Network Operations Center NORAD NORth American Defense Command NORM Naturally Occuring Radioactive Material NORML National Organization for the Reform of Marijuana Laws NOS Not Otherwise Specified NOSC Naval Ocean Systems Center NOTIS Network Operator Trouble Information System NOW Negotiable Order for Withdrawal [Banking] (Is this MA or NE specific?) NOx Nitrogen Oxides NP No Protest NP Nondeterministic-Polynomial NP Notary Public NP Noun Phrase NPA Numbering Plan Area (area code) [Telephony] NPC Non-Player Character (see PC) [Role-playing] NPL National Physical Laboratory (UK) NPL Non-Procedural Language NPN Negative-Positive-Negative (transistor) NPN NonProtein Nitrogen NPR National Public Radio NPR non-Processor Request [PDP11, UNIBUS] NQS Network Queuing System NRA National Reconstruction Act (FDR era US) NRA National Rifle Association NRAO National Radio Astronomical Observatory [Space] NRC National Research Council NRC Nuclear Regulatory Commission NRE Non-Recurring Engineering (as in NRE costs) NREN National (US) Research and Education Network NRL Naval Research Labs NRO National Reconnaissance Office NRO National Reconnaissance Organization [Space] NRZ Non-Return to Zero NRZI Non-Return to Zero Inverted (magnetic tape, 800 bpi) NS Neutron Star [Space] NS Not Specified NS Nova Scotia NS Nuclear Ship NSA National Security Agency [US Government] NSAP Network Service Access Point [OSI, Networking] NSC National (US) Security Council [US Government] NSE Network Software Environment NSF National (US) Science Foundation [US Government] NSS Nodal Switching System [NSFnet] NSSDC National Space Science Data Center [Space] NST Newfoundland Standard Time NSTS National Space Transportation System [Space] NSW New South Wales (Australia) NSWC Naval Surface Warfare Center NSWC Naval Surface Weapons Center NT New Testament NT Newfoundland Time NT Northern Territory NTEU National Treasury Employees Union NTIS National Technical Information Service NTN Neutralized Twisted Nematic

NTP Network Time Protocol [Internet] NTP Normal Temperature and Pressure (see STP) NTSB National Transportation Safety Board [US Government] NTSC National Television Standards Committee NTSC Never Twice Same Color NTT New Technology Telescope [Space] NTT Nippon Telephone & Telegraph NU Name Unknown NURBS NonUniform Rational B-Spline NUSC Naval Underwater Systems Center [US Government] NV Nevada NW North West NWNET NorthWestNet NWS National Weather Service NWT North West Territories (Australia) NXX NANP syntax for a three-digit string, N:{2-9}, X:{0-9} [Telephony] NY New York NYC New York City NYNEX New York and New England (Telephone) NYPD New York Police Department NYSE New York Stock Exchange NYSERNet New York State Educational and Research Network NZ New Zealand NZUSUGI New Zealand Unix System User Group, Inc. OA Office Automation OA Overeaters Anonymous OAO Orbiting Astronomical Observatory [Space] OAS Organization of American States OATS Office Automation Technology and Services OBE Order of the British Empire OBS Omni Bearing Selector OC Order of Canada OCDM Office of Civil Defense and Mobilization OCI Out of City Indicator OCLC Online Computer Library Center, Inc. OCLC Online Computer Library Center (Ohio College Library Catalog) OCO Object Code Only OCR Optical Character Recognition OCS Officer Candidate School OCST Office of Commercial Space Transportation [Space] OD Doctor of Optometry OD Oculus Dexter (right eye) OD Officer of the Day OD OverDose ODI Optical Digital Image ODISS Optical Digital Image Storage System ODT Octal Debugging Technique ODT Online Debugging Technique OE Old English OED Oxford English Dictionary OEM Original Equipment Manufacturer OEO Office of Economic Opportunity OES Order of the Eastern Star OEXP Office of Exploration [NASA] OF Old French OFM Order of Friars Minor

OFS Order of Free State OG Original Gum OH Ohio OIRA Office of Information and Regulatory Affairs OIU Office Interface Unit OJT On the Job Training OLTP On-Line Transaction Processing OMB Office of Management and Budget [US Government] OMD Orchestral Manouevers in the Dark OMS Orbital Maneuvering System [Space] OMV Orbital Maneuvering Vehicle [Space] ON Old Norse ONC Open Network Computing ONI Office of Naval Intelligence ONI Operator Number Identification [Telephony] ONR Office of Naval Research OOP Object Oriented Programming OOPART Out Of Place ARTifact OOPS Object-Oriented Programming System OP Observation Post OP OFFICEPOWER office automation system, trademark of CCI OP Order of Preachers OP Out of Print OPEC Organization of Petroleum Exporting Countries OPF Orbiter Processing Facility [Space] OPM Office of Personnel Management OPUS Obvious Password Utility System (Eugene Spafford <[email protected]>) OR Operating Room OR Oregon OR Owner's Risk, Own Risk ORFEUS Orbiting and Retrievable Far and Extreme Ultraviolet Spectrometer [Space] ORNL Oak Ridge National Laboratory OROM Optical Read Only Memory OS Oculus Sinister (left eye) OS Operating System OS Ordinary Seaman OS Out of Stock OSB Order of St. Benedict OSC Orbital Sciences Corporation [Space] OSCAR Orbiting Satelite Carry Amateur Radio (1st launched 12 Dec 1961) OSCAR Orbiting Satellite Carry Amateur Radio (1st launched 12 Dec 1961) OSCAR Orbiting Satellite Carrying Amateur Radio [Space] OSCRL Operating System Command Response Language OSD Office of the Secretary of Defense OSDIT Office of Software Development and Information Technology OSF Open Software Foundation OSF Open Systems Foundation OSF Order of St. Francis OSHA Occupational Safety and Health Administration [US Government] OSI Office of Scientific Integrity [NIH] OSI Open Systems Interconnection (per ISO; 7 layer model) OSI/RM Open Systems Interconnection/Reference Model OSME Open Systems Message Exchange OSP Optical Storage Processor

OSPFIGP Open Shortest-Path First Internal Gateway Protocol [Internet] OSS Office of Strategic Services (later CIA) OSS Office Support System OSS Operation Support System [Telephony, AT&T] OSSA Office of Space Science and Applications [Space] OSSE Oriented Scintillation Spectrometer Experiment (on GRO) [Space] OSTP Office of Science and Technology Policy OSTP (White House) Office of Science and Technology Policy [US Government] OT Old Testament OT OverTime OTA Office of Technical Assistance OTA Office of Technology Assessment OTA Optical Telescope Assembly (on HST) [Space] OTB Off-Track Betting OTC Over The Counter (stocks) OTF Open Token Foundation OTH-B Over The Horizon - Backscatter (as in radar) OT&LF Open Taxi & Limousine Foundation OTR On The Rag OTS Officers' Training School OTV Orbital Transfer Vehicle [Space] OUTWATS OUTward Wide Area Telephone Service [Telephony] OV Orbital Vehicle [Space] OV Orbiter Vehicle [Space] PA Pennsylvania PA Per Annum PA Play Aid PA Power of Attorney PA Press Agent PA Private Account PA Public Address PA Purchasing Agent PABX Private Automatic Branch eXchange [Telephony] PACCOM Pacific Computer Communications network consortium [Networking] PACX Private Automatic Computer eXchange PAD Packet Assembler-Disassembler [Networking] PAH Polycyclic Aromatic Hydrocarbon PAL Phase Alternation Line-rate PAL Programmable Array Logic PAM Payload Assist Module [Space] PAM Pulse Amplification Modulation PARC Palo Alto Research Center, xerox PASS Personal Access Satellite System [NASA] PATROL Program for Administrative Traffic Reports On Line PBM Play By Mail game PBS Public Broadcasting System PBX Private Branch eXchange [Telephony] PC Peace Corps PC PerCent; PerCentage PC Personal Computer (IBM wants you to believe a specific kind) PC Player Character (see NPC) [Role-playing] PC Post Card PC Post Cibum (after meals) PC Privileged Character PC Privy Council PC Program Counter

PC PC PC/AT PCB PCB PC-DOS PCI PCIE PCL PCM PCM PCPC PCS PCTE PCTS PD PD PD PD PDAD PDE PDES PDF PDL PDL PDN PDP PDP PDP PDQ PDS PDT PE PE PE PE PE PE PEI PEP PEPE PERL PERL PEX PFC PG PGA PGA PHA PHIGS PHS PhysRev PI PI PI PIC PIC

Progressive Conservative party [Canada] Providence College Personal Computer/Advanced Technology PolyChlorinated Biphenyl Printed Circuit Board Personal Computer DOS Panel Call Indicator President's Council on Integrity and Efficiency Printer Command Language Plug-Compatible Mainframe Pulse Code Modulation Personal Computers Peripheral Corporation Permanent Change of Station Portable Common Tools Environment Posix Conformance Test Suite Per Diem Police Department Potential Difference Public Domain Proposed Draft ADdendum Partial Differential Equation Product Data Exchange Specifications Program Development Facility Page Description Language Program Design Language Public Data Network Plasma Display Panel Programmed Data Processor Programmed Data Processor [DEC] Pretty Damned Quick Premises Distribution System [AT&T] Pacific Daylight Time Phase Encoded Physical Education Prince Edward island Printer's Error Professional Engineer Protestant Episcopal Prince Edward Island Productivity Enhancement Project Pepe Est Presque Emacs Pathologically Eclectic Rubbish Lister Practical Extraction and Report Language Phigs/phigs+ Extension to X Plasma Fusion Center [MIT] Parental Guidance (suggested) [Movie rating] Professional Graphics Adapter Pure Grain Alcohol Pulse Height Analyzer (or Analysis) Programmers Hierarchical Interactive Graphics System Public Health Service Physical Review Journal - Phys Rev Principal Investigator Priority Interrupt Private Investigator Plastic/Polyethelene Insulated Cable [Telephony] Position Independant Code

PIF Paid In Full PIT Principal, Interest, and Taxes PIXEL PIcture ELement PLA Programmable Logic Array PLATO Programmed Learning for Automated Teaching Operations (U. Ill., early '70s) PLC Programmable Logic Controller PLCC Plastic Leaded Chip Carrier PLL Phase-Locked Loop PLM Programming Language for Microcomputers PLO Palestine (sic?) Liberation Organization (?) PLO Please Leave On PLSS Portable Life Support System [Space] PM PayMaster PM Police Magistrate PM Post Meridiem PM Post Meridiem (after noon) PM PostMaster PM PostMortem PM Pressurized Module [Space] PM Preventive Maintenance PM Prime Minister PM Provost Marshal PMC Permanently Manned Capability [Space] PMIRR Pressure Modulated InfraRed Radiometer (on Mars Observer) [Space] PMO Prime Minister's Office PMOS P channel Metal Oxide Semiconductor (P-MOS) (see MOS) PMS PreMenstrual Syndrome PMT PhotoMultiplier Tube PM/X Presentation Manager for X windows PN Promissory Note PNP Positive-Negative-Positive (transistor) PO Petty Officer PO Post Office PO Postal Order PO Purchase Order POC Port Of Call POD Pay On Delivery POE Port Of Embarkation POE Port Of Entry POGO Polar Orbiting Geophysical Observatory POM Phase Of Moon POP Point of Presence [Telephony] POP Post Office Protocol [Networking] (esp. TCP/IP) POPS Paperless Order Processing System POR Price On Request POS Point Of Sale POS Professional Operating System [DEC] POSI Promoting conference for OSI POSIX Portable Operating System for unIX POSIX Portable Operating System Interface POTS Plain Old Telephone Service [Telephony] POTV Personnel Orbit Transfer Vehicle [Space] POV Point Of View POW Prisoner Of War PP Parcel Post

PP PP PP PPB PPC PPCS PPM PPN PPN PPP pps PPS PPT PPT PPT PQ PR PR PR PRC PREPnet PRI PRN PROFS PROM PS PS PS PS PS PS PS PSA PSC PSC PSDN PSDS PSE PSF PSG PSI PSI PSK PSL PSN PSR PSR PSS PST PSTN PT PT PT PT PTA PTD PTL

Past Participle Post Pay (payphone) [Telephony] Primary Point Parts Per Billion Pour Prendre Conge' (to take leave) Person to Person, Collect, Special [Telephony] Parts Per Million Parameterized Post-Newtonian formalism for general relativity Project Programmer Number Point-to-Point Protocol (successor to SLIP (q.v.)) Packets per Second PostPostScriptum Parts Per Trillion Pulse Pair Timing Punched Paper Tape Province of Quebec PayRoll Public Relations Puerto Rico Planning Research Corporation Pennsylvania Research & Economic Partnership Network Primary Rate Interface (ISDN) [Telephony] pro re nata [Medicine] (as needed?) PRofessional OFfice System [IBM] Programmable Read-Only Memory PicoSecond PostScript PostScriptum Power Steering Power Supply Proposed Standard Public School Problem Statement Analyzer Pittsburgh Supercomputer Center Polar Stratospheric Clouds Public Switched Data Network [Telephony] Public Switched Digital Service [Telephony, AT&T] Programming Support Environment Point Spread Function [Space] Platoon SerGeant Performance Systems International [Corporate name, Networking] Power Systems, Incorporated [Corporate name, Model Railroading] Phase Shift Keying Problem Statement Language Packet Switch Node [ARPANET/MILNET] (replaced IMP) Product Specific Realizations PulSaR [Space] (unknown to me, but something in the UK environment) Pacific Standard Time Public Switched Telephone Network Pacific Time Patrol Torpedo (as in PT boat) Physical Therapy Physical Training Parent-Teacher Association Parallel Transfer Disk Praise The Lord (ministry)

PTN Plant Test Number [Telephony] (actual number assigned for 800 service) PTO Patent and Trademark Office PTO Please Turn Over PTO Power Take-Off PTT Post, Telephone and Telegraph administration PTV Passenger Transport Vehicle [Space] PUC Public Utilities Commision PV Photovoltaic [Space] PVC Permanent Virtual Circuit (see also VC) PVC Poly-Vinyl Chloride PVO Pioneer Venus Orbiter [Space] PW Prisoner of War (usually POW) PWG Permanent Working Group PX Post eXchange (see BX) QAM Quadrature Amplitude Modulation QC Quality Control QC Queen's Counsel (KC when queen reigning) QD Quaque Die (daily) [Medicine] QDA Quantity Discount Agreement QED Quod Erat Demonstrandum (which was to be demonstrated) [Latin] QEF Quod Erat Faciendum (which was to be done) [Latin] QEI Quod Erat Inveniendum (which was to be found out) [Latin] QET Quantum Effect Transistor QIC Quarter-Inch Cartridge QID Quater In Die (four times a day) [Medicine] QLI Query Language Interpreter QM QuarterMaster QMC QuarterMaster Corps QMF Query Management Facility QMG QuarterMaster General QMS Quality Micro Systems [Corporate name] QNS Quantity Not Sufficient QSO Quasi-Stellar Object [Space] q.v. ???? (Latin(?): which see) QWERTY first six keys from left on top alphabetic row of standard keyboard R Restricted [Movie rating] R Rolemaster RA Regular Army RA Research Assistant RA Royal Academy RAAF Royal Australian Air Force RACE Random Access Card Equipment RACEP Random Access and Correlation for Extended Performance RAD Radiation Absorbed Dose RAD Rapid Access Disk RADAR RAdio Detection And Ranging RADM Rear ADMiral RAF Royal Air Force RAM Random Access Memory (R/W) RAM Red Academicia de Mexico (Mexican Academic Network) RARDE Royal Armaments Research and Development Establishment RARE R\'eseaux Associ\'es pour la Recherche Europ\'eenne (the European Organization of Research Networks) RAS Reliability, Availability, and Serviceability RASC Residence Account Service Center

RATS Radio Amateur Telecommunications Society R&B Rhythm and Blues (commonly R and B) RBC Red Blood Count RBI Runs Batted In RBOC Regional Bell Operating Company RC Red Cross RC Regional Center RC Resistor-Capacitor circuit (as in filters) RC Roman Catholic RCA Radio Corporation of America [Corporate name] RCAF Royal Canadian Air Force RCAS Reserve Component Automation System RCC Radio Common Carrier RCMP Royal Canadian Mounted Police RCS Reaction Control System [Space] R&D Research and Development (commonly R and D) RD Rural Delivery RDA Remote Data Access RDBMS Relational DataBase Management System RDF Radio Direction Finding REA Rail Express Agency RECON Reconnaissance REM Rapid Eye Movement REO R. E. Olds REO Removable, Erasable, Optical RETMA Radio {something(equipment?)?} {something?} Manufacturers' Association (????) REXX Restructured EXtended eXecutor RF Radio Frequency RF Radio Frequency [Space] RFC Request For Comments (ala ARPA Internet) RFD Rehoboth (MA) Fire Department RFD Rural Free Delivery RFI Radio Frequency Interference RFI Radio Frequency Interference [Space] RFP Request for Proposal RFQ Request for Quote RFS Remote File System RGB Red Green Blue RGP Raster Graphics Processor RH Right Hand RHC Regional (Bell) Holding Company RHS Right Hand Side RI Rhode Island RIACS Research Institute for Advanced Computer Science (NASA) RIACS Research Institute for Advanced Computer Science [Space] RIAS Radio In the American Sector, berlin RIF Reading Is Fundamental RIF Reduction In Force RILM Repertoire International de Literature Musicale RIP Rest In Peace (or Requiescat In Pace : latin) RIP Routing Interchange Protocol RIPE R\'eseaux IP Europ\'eenne (European IP Networks) (of RARE, q.v.) RISC Reduced Instruction Set Computer RITA Recognition of Information Technology Achievement award RJE Remote Job Entry RLC Resistor Inductor Capacitor

RLG RLIN RLL RMA RMA RMATS RMS RMS RMS RMS RN RN RNA RNGC RNZAF ROFF ROG ROM ROM ROM ROSAT ROSE ROSE ROTC ROTS ROYGBIV RPC RPG RPG RPI RPM RPN RPO RPS RPV RQ RR RR RR RRO RS RS RS RS RS RSCS RSFSR RSN RSU RSV RSVP RSWC RT RT RTA RTAC RTF

Research Libraries Group Research Libraries Information Network (run by RLG (q.v.)) Run Length Limited Radio Manufacturers' Association Return Materials Authorization Remote Maintenance Administration and Traffic System [Telephony] Remote Manipulator System [Space] Richard M. Stallman Root Mean Square Royal Mail Ship Registered Nurse Royal Navy RiboNucleic Acid Revised New General Catalog [Space] Royal New Zealand Air Force Run-OFF Receipt Of Goods Range Of Motion [Medicine] Read-Only Memory Rupture Of Membrane (as in birth) ROentgen SATellite [Space] RATS (q.v.) Open Systems Environment Remote Operations Service Entity (per ISO/CCITT layer 7) Reserve Officers' Training Corps Rotary Out Trunks Selectors Red, Orange, Yellow, Green, Blue, Indigo, Violet Remote Procedure Call RePort Generator Role Playing Game Rensselaer Polytechnic Institute Revolutions Per Minute Reverse Polish Notation Railway Post Office Revolutions Per Second Remotely Piloted Vehicle RuneQuest RailRoad Route Relay Rural Route Rate and Route Operator [Telephony] Recommended Standard (EIA) Recording Secretary Revised Status Right Side Royal Society Remote Spooling Communications Subsystem Russian Soviet Federated Socialist Republic Real Soon Now Remote Switching Unit Revised Standard Edition Repondez S'il Vous Plait (please reply) Right Side up With Care RadioTelephone RealTime Remote Trunk Arrangement [Telephony] Regional Technical Assistance Center [Telephony] Rich Text Format

RTFM Read The @!# Manual RTFM Read The F***ing Manual RTG Radioisotope Thermoelectric Generator RTG Radioisotope Thermoelectric Generator [Space] RTLS Return To Launch Site (Shuttle abort mode) [NASA, Shuttle, Space] RTR Ready to Run [Model Railroading] RTR Reel-To-Reel RTS Request To Send (EIA RS-232-C) RTTY Radio Teletype RU Receive Unit RVD Remote Virtual Disk [MIT] RW Right Worshipful RW Right Worthy RX Receive Ry Railway S South S Supplement SA Salvation Army SA Seaman Apprentice SA Service Assistant SA Sex Appeal SA Sine Anno (without date) SA South Africa SA South America SA Subject to Approval SAA South Atlantic Anomaly SAA South Atlantic Anomaly [Space] SAA Systems Application Architecture SAC Special Area Code [Telephony] (represent services, not places) SAC Strategic Air Command (see TAC) SAC Strategic Air Command [US military] SADD Students Against Drunk Driving SAFENET Survivable Adaptable Fiberoptic Embedded Network [US Navy] SAM Surface to Air Missile SAM Surface-to-Air Missile SAMA Step-by-step Automatic Message Accounting [Telephony] SAMPEX Solar Anomalous and Magnetospheric Particle EXplorer [Space] SAMTO Space And Missile Test Organization [Space] SAO Smithsonian Astrophysical Observatory [Space] SAP Second Audio Program SAP Service Access Point [OSI, Networking] SAR Search And Rescue SAR Synthetic Aperture Radar SARA Satellite pour Astronomie Radio Amateur [Space] SARA Stichting Academisch Rekencentrum Amsterdam (Amsterdam Universities Computing Center) SAREX Search and Rescue Exercise [Space] SAREX Shuttle Amateur Radio Experiment [Space] SARTS Switched Access Remote Test System SAS Small Astronomy Satellite SAS Space Activity Suit [Space] SASE Self-Addressed Stamped Envelope SASI Shugart Associates Systems Interface SAT Satellite [Space] SAW Surface Acoustic Wave SBA Small Business Administration

SC SC S&C SC S/C SC SCA SCAD SCADC SCAME SCAMP SCAN SCC SCC SCCS SCE SCE SCI SCIFI SCO SCOOPS SCOTS SCSI SCT SCUBA SCUD SD SDB SDI SDI SDIO SDLC SDM SDN SDN SDO SDSC SDV SE SE SEATO SEC SECNAV SED SEI SEI SEL SEM SEST SETI SETI SF SF SF SF SFRPG SG

Secondary Channel Sectional Center Skull & Crossbones South Carolina SpaceCraft [Space] SubCommittee Shuttle Carrier Aircraft [Space] Subsonic Cruise Armed Decoy Standard Central Air Data Computer SCreen oriented Anti-Misery Editor Single-Chip A-series Mainframe Processor Switched Circuit Automatic Network Specialized Common Carriers Switching Control Center Source Code Control System Signal Conversion Equipment Structure Chart Editor SpaceCraft Incorporated SCIence FIction (often used pejoratively of what really isn't) Santa Cruz Operation SCheme Object Oriented Programming System Surveilance and Control Of Transmission Systems Small Computer Systems Interface Schmidt-Cassegrain Telescope [Space] Self Contained Underwater Breathing Apparatus Subsonic Cruise Unarmed Decoy South Dakota Source(?) DeBugger Standard Disk Interconnect [DEC] Strategic Defense Initiative [Space, US Government] Strategic Defense Initiative Organization [Space, US Government] Synchronous Data Link Control [IBM] Sub-rate Data Multiplexer Software Defined Network [Telephony, AT&T] System Development Network (Korea) Staff Duty Officer San Diego Supercomputer Center Shuttle Derived Vehicle [Space] Service Engineer (see also CE, FE) South East SouthEast Asia Treaty Organization Security Exchange Commission SECretary of the NAVy Stream EDitor Software Engineering Institute (Carnegie Mellon) Space Exploration Initiative [Space] Software Engineering Laboratory Scanning Electron Microscope Swedish-European Submillimeter Telescope [Space] Search for Extra Terrestrial Intelligence [Space] Search for ExtraTerrestrial Intelligence [Space] San Francisco Science Fiction; Speculative Fiction Standard Form Star Frontiers Science Fiction Role Playing Game StarGuard

SG SubGroup SGML Standard Generalized Markup Language SHAPE Supreme Headquarters Allied Powers Europe SHAR SHell ARchiver SHCD Sherlock Holmes Consulting Detective SHF Super High Frequency (3-30GHz) SHRPG Super Hero Role Playing Game SI Staten Island SIAM Society for Industrial and Applied Mathematics SID Sudden Ionospheric Disturbance [Space] SIG Special Interest Group SIGCAT Special Interest Group for Cd-rom Applications Technology SIMD Single Instruction, Multiple Data SIMM Single In-line Memory Module SIMM System Integrated Memory Module SINE SINE is not EINE SIPS Satellite Imagery Processing System SIR Shuttle Imaging Radar [Space] SIRTF Space (formerly Shuttle) InfraRed Telescope Facility [Space] SIRTF Space Infrared Telescope Facility [Space] SIS Strategic Information System SISCOM Satellite Information System COMpany SITA Societe Internationale Telecommunications Aeronautiques SJ Society of Jesus Skyhook Surface to space "elevator" transportation system [Space] SL Salvage Loss SL Space Launch [Space] SL SpaceLab [Space] SLA Special Libraries Association SLA Synchronous Line Adapter SLAC Stanford Linear Accelerator Center SLAN Sine Loco, Anno, (vel) Nomine (without place, year, or name) SLAR Side Looking Airborne Radar SLAR Side-Looking Airborne Radar [Space] SLBM Submarine Launched Ballistic Missiles SLC Space Launch Complex [Space] SLC Subscriber Loop Carrier [Telephony] SLDC Synchronous Data Link Control SLIP Serial Line Internet Protocol SLIP Serial Line IP (sometimes SL/IP) (see also PPP) SLP Super Long Play (VHS VCR) SLS Space(lab) Life Sciences [Space] SM Service Mark SMA Sergeant Major of the Army SMA Spectrum Manufacturers Association SMC Small Magellanic Cloud (see LMC) SMC Small Magellanic Cloud [Space] SMD Storage Module Device (interface standard for disk drives) SMD Surface Mounted Devices SMDR Station Message Detail Recording [Telephony] SMDS Switched Multi-megabit Data Service [Telephony, Networking] SME Solar Mesosphere Explorer [Space] SMEGMA Sophisticated Modern Editor with Gloriously Magnificent Abilities SMERSH Abbr. of Russian phrase meaning "Death to the spies." SMEX SMall EXplorers [Space] SMILS Sonobuoy Missile Impact Location System

SMM Solar Maximum Mission (satellite 1980-1989) [Space] SMTP Simple Mail Transfer Protocol SMU Southeastern Massachusetts University SMU Southern Methodist University SN Science News [Periodical] SN Serial Number SN Super Nova SN SuperNova (e.g., SN1987A) [Space] SNA Systems Network Architecture [IBM] SNADS SNA Distribution Services SNAFU Situation Normal -- All Fouled Up (also more profane versions) SNAP Shipboard Non-tactical Automated data Processing program SNAP Sub Network Access Protocol [OSI, Networking] SNCF Societe National des Chemins de Fer (French National Railways) SNF Server-Natural Format SNMP Simple Network Management Protocol [TCP/IP] SNOBOL StriNg Oriented symbOLic Language SNPA SubNetwork Point of Attachment SNR Signal to Noise Ratio SNR Signal to Noise Ratio [Space] SNR SuperNova Remnant [Space] SNU Solar Neutrino Units [Space] SO Seller's Option SO Significant Other SO Space Opera SO Strike Out SOAP Symbolic Optimizing Assembler Program SOFIA Stratospheric Observatory For Infrared Astronomy [Space] SOH Start Of Header, ASCII control character (dec=01,control-A) SOHIO Standard Oil of oHIO [Corporate name] SOHO SOlar Heliospheric Observatory [Space] SOL Short on Landing (or, colloquially, Shit Out of Luck) SONAR SOund Detection And Ranging SONET Synchronous Optical Network [Telephony] SOP Standard Operating Procedure SOS Save Our Souls (International standard distress call, Morse ...---...) SOS Silicon On Sapphire SOS Son of Stopgap (editor) [DEC] SP Shore Patrol SP Short Play (VHS VCR) s.p. sine prole (Latin: without issue) [Genealogy] SP Southern Pacific [Corporate name, Railroading] SP Stack Pointer SP Star Patrol SPA Software Publishers Association SPAG Standards Promotion and Applications Group SPAN Space Physics and Analysis Network [NASA] (DECnet) SPAN Space Physics and Analysis Network [Space] SPAR Stock Points Adp Replacement SPARC Scalable Processor ARChitecture SPARC Standards, Planning, And Requirements Committee SPAWAR naval SPAce and WARfare command SPC Software Productivity Consortium SPCA Society for the Prevention of Cruelty to Animals SPCC Society for the Prevention of Cruelty to Children SPDM Special Purpose Dextrous Manipulator [Space]

SPEC Systems Performance Evaluation Cooperative SPITBOL SPeedy ImplemenTation of snoBOL SPNI Society for the Protection of Nature in Israel SPOT Systeme Probatoire pour l'Observation de la Terre [Space] SPS Solar Power Satellite [Space] SPUR Systech Pluraxial Unplug Repeater SQE Signal Quality Error (IEEE 802.3, eqv to D/I/X "Collision Presence Test") [Ethernet] SQIID Simultaneous Quad Infrared Imaging Device (at NOAO) SQL Structured Query Language SQUID Superconducting QUantum Interference Device SRAM Short Range Attack Missile SRAM Static RAM SRB Solid (fuel) Rocket Booster [Space] SRG Short and Ring Ground (test) [Telephony] SRI Stanford Research Institute SRM Solid Rocket Motor [Space] SRO Standing Room Only SS7 Signalling System #7 [Telephony] SSA Social Security Administration [US Government] SSB Single Side Band SSC Superconducting Super Collider SSE South-SouthEast SSF Space Station Fred (er, Freedom) [Space] SSF Space Station Freedom [NASA, Space] SSFF Showcase Software Factory of the Future SSG Staff SerGeant SSI Small Scale Integration SSI Solid-State Imager (on Galileo) [Space] SSI Space Services Incorporated [Corporate name, Space] SSI Space Studies Institute [Space] SSI Supplemental Security Income SSME Space Shuttle Main Engine [Space] SSPF Space Station Processing Facility [Space] SSPS Satellite Solar Power Station [Space] SSR Secondary Surveillance Radar SSR Soviet Socialist Republic SSRMS Space Station Remote Manipulator System [Space] SST Spectroscopic Survey Telescope [Space] SST SuperSonic Transport [Space] SSTO Single Stage To Orbit [Space] SSTV Slow Scan TeleVision SSW South-SouthWest ST Short Ton STARS Software Technology for Adaptable, Reliable Systems STD Sacrae Theologiae Doctor (doctor of sacred theology) STD Sexually Transmitted Disease (replaces VD) STD State Transition Diagram STD Subscriber Trunk Dialing (British, and elsewhere; equiv. DDD in USA) STI Standard Tape Interconnect [DEC] STILO Scientific and Technical Intelligence Liaison Office STIS Space Telescope Imaging Spectrometer (to replace FOC and GHRS) [Space] STL St. Louis (airport designation) STN SuperTwisted Nematic STOL Short TakeOff and Landing

STP Shielded Twisted Pair [Telecom, Networking] STP Software Through Pictures STP Standard Temperature and Pressure (see NTP) STRPG Star Trek: The Role-Playing Game STS Space Transportation System (space shuttle) [NASA] STScI Space Telescope Science Institute [Space] STV Single Transferable Vote STV Space Transfer Vehicle [Space] SUM Symantec Utilities for Macintosh SUN Stanford University Network SUN SUN MicroSystems Computer (not an Acronym) [Corporate name] SUNOCO SUN Oil COmpany [Corporate name] SUNY State University of New York SURAnet Southeastern Universities Research Association Network SVID System V Interface Definition SW South West SW SuperWorld SWAS Submillimeter Wave Astronomy Satellite [Space] SWBT South Western Bell Telephone [Telephony] SWF ShortWave Fading [Space] SWIFT Society for Worldwide Interbank Financial Communications SWS Scientific Workstation Support SXS Step by Step switching [Telephony] T Traveler T1 1.544Mbps [Telephony], one of the basic signalling systems 24x64Kb T3 45Mbps (eq 28 T1 channels) [Telephony] TA Teaching Assistant TAC Tactical Air Command (see SAC) TAC Terminal Access Controller [ARPANET/MILNET] (replaced TIP) TACACS Terminal Access Controller Access Control System [ARPANET/MILNET] TACCS Tactical Army Combat service support Computer System TAE Transportable Applications Environment TAL Trans-Atlantic Abort Landing [NASA, Shuttle] TAL Transatlantic Abort Landing (Shuttle abort plan) [Space] TANSTAAFL There Ain't No Such Thing As A Free Lunch TAR Tape ARchiver TASI Time Assign{ment,ed} Speech Interpolation [Telephony] TAU Thousand Astronomical Units [Space] TB TuBerculosis TBA To Be Announced TBD To Be Determined TBD To Be Done TC Teachers College TCA Terminal Controlled Airspace TCP Transmission Control Protocol TCP/IP Transmission Control Protocol/Internet Protocol TCS Thermal Control System [Space] TCSEC Trusted Computer System Evaluation Criteria (orange book) TCT To Challenge Tomorrow TD Tardive Dyskinesia TD TouchDown TD Treasury Department TDCC Transportation Data Coordinating Committee TDE Transition Diagram Editor TDI Trusted Database Interpretation

TDM TDR TDRS TDRSS TDY TECO TECO TEFLON TES TFP TFS TFT TFT TG TGV TGV THIEF THIEF THOR TI TIA TIA TIC TID TID TIFF TIP TIS TISN TKO TL TLA TLC TLI TM TMA TMAC TMIS TMO TMP TMRC TMRC TN TN TNC BNC) TNF TNP TNT TO TO TODS TOMS TOMS TOOIS TOP TOPLAS

Time-Division Multiplexer Time Domain Reflectometer Tracking and Data Relay Satellite [Space] Tracking and Data Relay Satellite System [Space] Temporary DutY Tape Editor and COrrector Text Editor and COrrector polyTEtraFLuOrethyleNe Thermal Emission Spectrometer (on Mars Observer) [Space] Tops Filing Protocol Translucent File System The Fantasy Trip Thin Film Transistor Thieves' Guild Tres Grande Vitesse (French, Very High Speed) [Railroading] Two Guys and a VAX (humorous variant) [Corporate name] THief Isn't Even Fine This Here Isn't Even Fine Tandy High-intensity Optical Recording Texas Instruments Thanks In Advance [Net jargon] Transient Ischemic Attack TermInfo Compiler Ter In Die (three times a day) Transaction ID Tag Image File Format Terminal Interface Processor [ARPANET/MILNET] (replaced by TAC) Trusted Information Systems [Corporate name] Tokyo International Science Network (Japan) Technical Knock Out [Boxing] Total Loss Three Letter Acronym Tender Loving Care Transort-Level Interface TradeMark Tycho Magnetic Anomaly (movie 2001) Treasury department's Multiuser Acquisition Contract Telecommunications Management Information System Telephone Money Order The Morrow Project Tech Model Railroad Club [MIT] Transportation Modeling Research Center (TMRC {above} alter ego) Tennessee Twisted Nematic Threaded Neill Concelman (connector) [Electronics] (see also Tumor Necrosis Factor [Biology, Medicine] Tech Nickel Plate (RR) [TMRC] TriNitro Toluene Telegraph Office Turn Over Transactions on Database Systems (ACM) Total Ozone Mapping Spectrometer [Space] Transactions on Mathematical Software (ACM) Transactions on Office Information Systems (ACM) Technical Office Protocol Transactions on Programming Languages and Systems (ACM)

TOPS Traffic Operator Position System [Telephony] TOPSMP Traffic Operator Position System Multipurpose [Telephony] TORES Text ORiented Editing System TOS Transfer Orbit Stage [Space] TOW Tube launched, Optically tracked, and Wire guided TOY Time Of Year (clock) TP Transaction Processing TP Transport Protocol (ISO/CCITT Transport Services (TP0-TP4); like TCP) TP4 Transport Protocol, class 4 [ISO] TPC The Phone Company (from classic movie: _The President's Analyst_) TPI Tracks Per Inch TPO Traveling Post Office TPP TetraarylPorPhyrin TPS Technical Publishing Software TPS TeleProcessing Services TPS Thermal Protection System [Space] TR Tech Report (at least at LCS (q.v.), maybe others) TR Technical Reference [Bell, Telephony] TRG Tip and Ring Ground (test) [Telephony] TROFF Text RunOFF, text formatter TRUSIX TRUSted unIX TRW Thompson, Ramo, and Woolridge TS Top Secret TSAP Transport Service Access Point [OSI, Networking] TSD Total System Design TSP Teleprocessing Services Program TSP Thrift Savings Plan TSP Time Synchronization Protocol TSP TriSodium Phosphate TSR TSR (Fortune 500 Company that manufactures Dungeons & Dragons) TSS Tethered Satellite System [Space] TSTO Two Stage to Orbit [Space] T&T Tunnels & Trolls TTFN Tah Tah, For Now TTL Transistor Transistor Logic TTMA Tennessee Tech Microcomputer Association TTU Tennessee Technological University TTY TeleTYpe TUNIS Toronto UNIversity System TV TeleVision TVA Tennessee Valley Authority TW Thieves' World TWA Trans World Airlines [Corporate name] TWB Terrestrial WideBand [Networking, DARPA] TWIMC To Whom It May Concern TWT Traveling Wave Tube TWX TeletypeWriter eXchange TX Texas Tx Transmit u (representing the greek mu) - micro U Universe UA United Artists UAR United Arab Republic UAR User Action Routine UARS Upper Atmosphere Research Satellite [Space]

UART UBA UBC UBC UBM UCAR UCB UCD UCD UCI UCL UCLA UCR UCSB UCSC UCSD UCSF UDB UDMH UDP UEC UFO UGC UH UHF UID UID UIMS UIT UIUC UK UKST UL ULANA UMOC UMT UN UNESCO UNICEF United UNICS UNIX UNMA UNO UP UPC UPI UPI UPS UPS UR URI US USA USA USA USAF

Universal Asynchronous Receiver Transmitter UniBus Adapter [DEC] Universal Bibliographic Control University of British Columbia Unpressurized Berthing Mechanism [Space] University Corporation for Atmospheric Research University of California at Berkeley Uniform Call Distributor [Telephony] University of California at Davis University of California at Irvine University College London University of California at Los Angeles University of California at Riverside University of California at Santa Barbara University of California at Santa Cruz University of California at San Diego University of California at San Francisco Unified DataBase Unsymmetrical DiMethyl Hydrazine [Space] User Datagram Protocol User Environment Component Unidentified Flying Object [Space] Uppsala General Catalog [Space] Upper Half Ultra High Frequency (300-3000MHz) Unique IDentifier User IDentification [UNIX] User Interface Management System Ultraviolet Imaging Telescope (Astro package) [Space] University of Illinois at Urbana-Champaign United Kingdom United Kingdom Schmidt Telescope [Space] Underwriters Laboratory Unified Local-Area Network Architecture Ugliest Man On Campus [MIT] Universal Military Training United Nations United Nations Educational, Scientific, & Cultural Organization United Nations International Children's Emergency Fund (now Nat. Child. Fund) UNiplex Information Computer Services Not an acronym at all. Was a joke on MIT's MULTICS. Unified Network Management Architecture [AT&T] United Nations Organization Union Pacific [Railroading, Corporate name] Universal Product Code United Press International United Press International [Corporate name] Uninterruptible Power Supply United Parcel Service [Corporate name] University of Rochester University of Rhode Island United States (of America) Union of South Africa United States Army United States of America United States Air Force

USAFA USAN USB USC USCG USDA USES USFL USGS USIA USM USMC USMP USN USO USO USP USPS USR USS USSR USSS USW UT UT UT UT UTC UTC UTnet UTP UUCP UUG UV UVS UW UW VA VA VAB [Space] VAFB VAN VANS VAR VASI VAT VAX VAXBI VC VC Vcc VCM VCO VCR VCU VD

United States Air Force Academy (in Colorado Springs) University Satellite Network Upper Side Band University of Southern California United States Coast Guard United States Department of Agriculture United States Employment Service United States Football League United States Geological Survey United States Information Agency United States Mail United States Marine Corps United States Microgravity Payload [Space] United States Navy United Service Organizations Unix Software Operation United States Pharmacopeia United States Postal Service User Service Routines United States Ship Union of Soviet Socialist Republics User Services and Systems Support Und So Weiter Universal Time (a.k.a. GMT, UTC, or Zulu Time) University of Tennessee University of Texas UTah Coordinated Universal Time (a.k.a. UT) Universal Coordinated Time (a.k.a. UT) University of Texas Network Unshielded Twisted Pair [Telecom, Networking] UNIX-to-UNIX Copy Program Unix User Group UltraViolet UltraViolet Spectrometer UnderWriter Univ of Wisconsin Veterans Administration Virginia Vehicle Assembly Building (formerly Vertical Assembly Building) Vandenberg Air Force Base [Space] Value Added Network (e.g. Tymnet, Telenet, etc) Value-Added Network Services Value Added Remarketer (reseller) Visual Approach Slope Indicator Value Added Tax Virtual Address eXtended VAX Bus Interconnect Viet Cong Virtual Circuit Voltage (Common Cathode?) Voice Coil Motor Voltage Controlled Oscillator VideoCassette Recorder Virginia Commonwealth University Venereal Disease (see also STD)

VDFM VDI VDM VDM VDT VEEGA VF VF VFO VFR VFW VFW VG VG VGA Vgg V&H VHDL VHF VHS VHSIC VI VIABLE VILE VINE VIP VISTA VITA VJ VL VLA VLBA VLBI VLF VLIW VLSI VLT VM VM/CMS VMM VMOS VMR VMS VMS VOA VOIR VOIS VOQ VPI&SU VRC VRM VRM VSAT VSX VTAM VTOC VTOL

Virtual Disk File Manager Virtual Device Interface Vienna Development Method Virtual Device Metafile Video Display Terminal Venus-Earth-Earth Gravity Assist (Galileo flight path) [Space] Video Frequency Voice Frequency Variable Frequency Oscillator Visual Flight Rules [Aviation] Veterans of Foreign Wars Volunteer Fire Department Very Good Vicar-General Video Graphics Array Voltage (Gate to Ground?) Vertical and Horizontal (CO coordinate tape) [Telephony] Vhsic Hardware Description Language Very High Frequency (30-300MHz) Video Home System (VCR) Very High Speed Integrated Circuit VIsual editor Vertical Installation Automation BaseLinE VI Like Emacs Vine Is Not Emacs Very Important Person Volunteers In Service To America Vme International Trade Association Video Jockey Vulgar Latin Very Large Array [Space] Very Long Baseline Array [Space] Very Long Baseline Interferometry [Space] Very Low Frequency (3-30KHz) Very Long Instruction Word Very Large Scale Integration Very Large Telescope [Space] Virtual Memory Virtual Machine/Conversational Monitor System Virtual Memory Manager Vertical Metal Oxide Semiconductor (V-MOS) (see MOS) Vertical Market Reseller Vertical Motion Simulator [Space] Virtual Memory System [DEC] Voice Of America Venus Orbiting Imaging Radar (superseded by VRM) [Space] Voice-Operated Information System Visiting Officer's Quarters Virginia Polytechnic Institute and State University Vertical Redundancy Character Venus Radar Mapper (now called Magellan) [Space] Virtual Resource Manager Very Small Aperture Terminal (satellite dish) X/open Verification Suite Virtual Telecommunications Access Method [IBM] Volume Table Of Contents Vertical TakeOff and Landing

VTR VUP V&V VVSS W W WA WA WAC WAIS WARC WATS WB WB WBC WC WC WCTU WD w.d. WECo WFPC WFPCII WG WH WHBL WHCA WHO WI WIMP WIPP WIS WITS WIYN WMSCR WOM WOP WOPR WORM WOW w.p. WP WP WPI WSI WSMR WSW WTR WU WU WUPPE [Space] WV WW WWI WWII WWMCCS

VideoTape Recorder Vax Unit of Performance Villains & Vigilantes Vertical Volute Spring Suspension West Width Washington Western Australia Womens Air Corps Wide Area Information Server World Administrative Conference Wide Area Telephone Service Water Ballast WayBill White Blood Cells Water Closet Without Charge Women's Christian Temperance Union White Dwarf [Space] will dated [Genealogy] Western Electric Company [AT&T] (manufacturing arm of AT&T) Wide Field / Planetary Camera (on HST) [Space] Replacement for WFPC [Space] Working Group WarHammer World Home Bible League White House Communications Agency [US Government] World Health Organization Wisconsin Windows/Icons/Mouse Programming(?) (nuclear) Waste Isolation Pilot Plant [DOE] WWMCCS Information System Washington Interagency Telecommunications System Wisconsin / Indiana / Yale / NOAO telescope [Space] Weather Message Switching Center Replacement Write Only Memory WithOut Papers [Immigration] War Operations Planned Response (from "Wargames" movie) Write Once, Read Many times Worlds of Wonder will proved [Genealogy] Word Processing Working Paper Worcester Polytechnic Institute Wafer Scale Integration White Sands Missile Range [Space] West-SouthWest Western Test Range [Space] Washington University Western Union Wisconsin Ultraviolet PhotoPolarimter Experiment (Astro package) West Virginia World War World War I World War II World-Wide Military Command and Control System

WY WYSIWIS WYSIWYG XCF XD XDR XFER XINU XL XMM XMTR XNS XO XOR XPORT XSECT XTAL XUI XUV YA YACC YB YMCA YMHA YOB YP YRS YSO YST YT YT YTD YWCA YWHA Z Z Z ZB ZETA ZGS ZI ZIF ZIP ZK ZMRI ZPG ZPRSN ZST ZT ZWEI

Wyoming What You See Is What I See What You See Is What You Get eXperimental Computing Facility without Dividend eXternal Data Representation Transfer XINU Is Not UNIX eXtra Large X-ray Multi Mirror [Space] transMiTteR (the X is for trans) Xerox Network Services eXecutive Officer eXclusive OR (logical function) Transport cross SECTion crysTAL (another version of x for crys, see XMTR) X-windows User Interface eXtreme UltraViolet [Space] Yet Another Yet Another Compiler Compiler YearBook Young Mens Christian Association Young Mens Hebrew Association Year Of Birth Yellow Pages Ysgarth Rules System Young Stellar Object [Space] Yukon Standard Time Yukon Territory Yukon Time Year To Date Young Womens Christian Association Young Womens Hebrew Association Zenith Zero Zulu (time) Zero Beat Zero Energy Thermonuclear Assembly Zero Gradient Synchrotron Zonal Index Zero Insertion Force (connector/socket) Zone Improvement Plan (US post office code) barrage balloon (navy symbol) Zinc Metals Research Institute Zero Population Growth Zurich Provisional Relative Sunspot Number Zone Standard Time Zone Time Zwei Was Eine Initially