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| A1-C and A6-L | Early Apollo suit prototypes |
| A/S | Ascent stage (LM) |
| A7-L and A7-LB | Actual Apollo pressure suits worn on missions |
| AAP | Apollo Applications Program |
| ACBWG | Apollo Reentry Communications Blackout Working Group |
| ACE | acceptance checkout equipment; also automatic checkout equipment |
| ACED | AC Electronics Division, General Motors Corporation |
| ACRV | Assured Crew Return Vehicle (or) Astronaut Crew Rescue Vehicle |
| Actuator | Mechanism(s) used to start or initiate something |
| AEC | Atomic Energy Commission |
| AEDC | Arnold Engineering Development Center, Air Force |
| AES | Apollo Extension System, forerunner of Apollo Applications Program |
| AFETR | Air Force Eastern Test Range |
| AFRM | airframe |
| AFSC | Air Force Systems Command |
| ALEP | Apollo lunar exploration program |
| ALMAZ | 2nd generation Soviet manned orbital space station - military Salyut |
| ALS | Advanced Launch System |
| ALSCC | Apollo Lunar Surface Closeup Camera |
| ALSD | Apollo Lunar Surface Drill - drill used to bore holes into the lunar surface |
| ALSEP | Apollo Lunar Surface Experiments Package - name given to the various sets of experiments left on the moon by the Apollo crews - see also EASEP |
| AMS | Apollo mission simulator |
| AMU | Astronaut Manuevering Unit (preceeded MMU) |
| AOA | Abort Once Around (Shuttle abort plan); also Angle Of Attack |
| AOCS | Attitude and Orbit Control System |
| AOH | Apollo operations handbook |
| AP | Associated Press |
| APM | Attached Pressurized Module (a.k.a. Columbus) |
| Apollo | U.S. Manned lunar program |
| APU | Auxiliary Power Unit |
| ASP | Apollo Simple Penetrator - A pointed rod pushed into the lunar surface to determine it's penetration properties |
| ARC | Ames Research Center |
| Ariane | European commercial launch vehicle (rocket) |
| ARTEMIS | Advanced Relay TEchnology MISsion |
| AS | Apollo-Saturn |
| ASAT | Antisatellite weapon |
| Ascent stage | Upper part of LM used as cabin and to propel crew back into lunar orbit after landing operations were concluded |
| ASE | Active Seismic Experiment - ALSEP experiment |
| ASI | Agenzia Spaziale Italiana (Italian Space Agency) |
| ASPO | Apollo Spacecraft Program Office, MSC |
| ASRM | Advanced Solid Rocket Motor |
| ASSB | Apollo Site Selection Board |
| ASTP | Apollo-Soyuz Test Project - joint US/USSR docking mission of an Apollo CSM and Soviet Soyuz |
| astronaut | U.S./European space traveler |
| ASTT | Apollo Special Task Team |
| ATDA | Augmented Target Docking Adapter |
| ATM | Apollo Telescope Mount (Skylab) |
| ATO | Abort To Orbit (Shuttle abort plan) |
| BAC | Bell Aerospace Company or, before January 1970, Bell Aerosystems Company |
| Baikonour | Soviet/Russian space launch center |
| BeV | billion electron volts |
| BIG | Biological Isolation Garment special suit used by Apollo 11 crew after splashdown to isolate the crew from the environment of the earth in case they had been exposed to any possible pathogenic lunar organisms (germs) |
| Bore stem | Drill tube used with ALSD to drill holes into lunar surface to obtain deep core specimens of the moon and to place Heat Flow and Neutron Probe experiments sensors |
| BP | Boilerplate |
| BPC | Boost Protective Cover - launch cover used on Apollo CMs |
| BSLSS | Buddy Secondary Life Support System |
| BSS | Boeing Satellite Systems |
| Btu | British thermal units |
| Bubble Helmet | Pressure Helmet Assembly used inside spacecraft and under LEVA while on the moon. See also LEVA |
| Buran | "Snowstorm" Name given to only flown Russian space shuttle |
| CARIDS | customer acceptance review item dispositions |
| CARR | Customer Acceptance Readiness Review |
| CASE | Coordinated Aerospace Supplier Evaluation |
| cc | cubic centimeter(s) |
| CCAS/CCAFS | Cape Canaveral Air Station/Cape Canaveral Air Force Station |
| CCB | Configuration Control Board |
| CCD | Charge-Coupled Device |
| CCGE | Cold Cathode Gage Experiment - ALSEP experiment, similar to the CCIG (below) |
| CCIG | Cold Cathode Ion Gage - ALSEP experiment, similar to the CCGE (above) |
| CDR | Abbreviation for Commander, the man on an Apollo mission who had overall command of the mission, and who piloted the LM |
| Central Station | ALSEP component used to route commands and electrical power to the individual experiments and send experiment data to earth |
| CG | Center of Gravity |
| CGRO | (Arthur Holley) Compton Gamma Ray Observatory (was GRO) |
| Chromel R | Metallic cloth used on extravehicular space suits. It had great abrasion resistant properties. It was used on the boots, gloves, and backs of the extravehicular space suits. |
| Circumlunar | Around the moon. This indicated that the vehicle sent to the moon would not orbit the moon but merely loop around it, as in the Zond missions and Apollo 13 |
| CIRRIS | Cryogenic InfraRed Radiance Instrument for Shuttle |
| CM | Command Module - conical "capsule" or spacecraft used in Apollo to house the crew during all operations except the lunar landing. It was the "Mother Ship" of Apollo, and the only part of the entire rocket that returned to earth, also Center of Mass |
| cm | centimeter, centimeters |
| CMP | Command Module Pilot - crewman who piloted the CSM and remained in the CM in lunar orbit while the CDR and LMP descended to the moon |
| CNES | Centre National d'Etudes Spatiales - French Space Agency, most famous for the Ariane rocket |
| COBE | COsmic Background Explorer (satellite) |
| Communications Carrier (aka "Snoopy Cap") | Soft cloth cap worn while inside space suit, held microphones and earphones for radio and intercom communications |
| cosmonaut | Soviet/Russian/Eastern Bloc space traveler |
| COSMOS | Generic name given to any Soviet/Russian spacecraft before it's official function is made public |
| COSTAR | Corrective Optics Space Telescope Axial Replacement |
| CPLEE | Charged Particle Lunar Environment Experiment - ALSEP experiment |
| cps | cycles per second (see Hz) |
| CRAF | Comet Rendezvous / Asteroid Flyby (unmanned probe) |
| CRD | Cosmic Ray Detector - ALSEP experiment. Also see LSCRD |
| CRO | Call sign letters for Carnarvon, Western Australia tracking station |
| CRRES | Combined Release / Radiation Effects Satellite |
| CSA | Canadian Space Agency - builder of the Shuttle RMS and SSRMS |
| CSC | Contingency Sample Container |
| CSM | Command and Service Module - Combination of the Command Module and the Service Module |
| CSRC | Contingency Sample Return Container |
| cu m | cubic meter, cubic meters |
| CWG | Constant Wear Garment |
| Cyrillic | Russian alphabet system |
| DAC | Data Acquisition Camera |
| DCR | Design Certification Review |
| degrees C | degrees Celsius (centigrade) |
| degrees F | degrees Fahrenheit |
| Descartes-Cayley | Apollo 16 landing site |
| Descent stage | Bottom half of lunar module |
| DFI | development flight instrumentation |
| DLR | German space agency |
| DM | Docking Module |
| DOD | Department of Defense |
| DPS | descent propulsion system, pronounced DIPS |
| DSBD | Documented Sample Bag Dispenser |
| DSN | Deep Space Network |
| EAFB | Edwards Air Force Base |
| EASEP | Early Apollo Scientific Experiments Package small, simplified ALSEP package deployed on Apollo 11 consisted of PSEP, LR3, and SWC |
| ECP | engineering change proposal |
| ECS | environmental control system |
| EDCP | engineering design change proposal |
| EDD | Engineering and Development Directorate |
| EDS | emergency detection system |
| EDO | Extended Duration Orbiter (Shuttle) |
| EELV | Evolved Expandable Launch Vehicle (USAF program, Delta 4, Boeing) |
| ELS | earth landing system |
| ELV | Expendable Launch Vehicle - any rocket that is not reusable |
| EMS | entry monitor system |
| EMU | Extravehicular Mobility Unit Space suit used both in and outside of the spacecraft |
| Energiya | Russian design bureau (NPO), also Heavy Lift Russian booster |
| EO | engineering order |
| eV | electron volts(s) |
| ERBS | Earth Radiation Budget Satellite |
| ERTS | Earth Resources Technology Satellite |
| ESA | European Space Agency |
| ESOC | European Space Operations Center |
| ESRO | European Spatial Research Organization |
| ET | (Shuttle) External Tank, also Extraterrestrial |
| EVA | Extravehicular Activity Anything done by a crewman outside of a spacecraft, including moon walks and space walks in open space |
| Explorer | U.S. series of unmanned probes and satellites |
| F | Fahrenheit |
| FAI | Fédération Aéronautique International (International Aeronautical Federation) |
| FCOD | Flight Crew Operations Directorate |
| FCS | Fecal Containment System |
| FCSM | flight combustion stability monitor |
| FGS | Fine Guidance Sensors (on HST) |
| FHST | Fixed Head Star Trackers (on HST) |
| FOC | Faint Object Camera (on HST) |
| FOD | Flight Operations Directorate |
| FOS | Faint Object Spectrograph (on HST) |
| fps | feet per second |
| Fra Mauro | Landing site for Apollo 13 (which never landed) and Apollo 14 |
| FRR | Flight Readiness Review |
| ft | foot, feet |
| FUVC | Far Ultraviolet Camera - ALSEP experiment |
| G | specific gravity |
| g | gram, gravity, specific gravity |
| G- H- and J-Series Mission(s) | Apollo landing missions denoting the compexity of the missions. See Apollo Stats |
| GAEC | Grumman Aircraft Engineering Corporation |
| GAO | Government Accounting Office |
| GAS | Get-Away Special - small, cheap payload containers flown on board the U.S. Shuttle |
| GATV | Gemini Agena Target Vehicle |
| GCTA | Ground Controlled Television Assembly |
| GDS | Call sign letters for Goldstone, California tracking station |
| GE | General Electric Company |
| Gemini | Manned space program preceding Apollo, used to verify space activities such as EVA, rendezvous, docking, etc. |
| GEO | Geosynchronous Earth Orbit |
| GET | ground elapsed time |
| GFE | government-furnished equipment |
| GHRS | Goddard High Resolution Spectrograph (on HST) |
| GLEP | Group for Lunar Exploration Planning |
| GMT | Greenwich mean time |
| GOX | Gaseous OXygen |
| GPC | General Purpose Computer (Shuttle) |
| GPS | Global Positioning System |
| GRO | Gamma Ray Observatory (now CGRO) |
| GSE | ground support equipment |
| GSFC | Goddard Space Flight Center |
| GT | Gemini Titan |
| GTO | Geostationary Transfer Orbit |
| GWM | Call sign letters for Guam tracking station |
| Hadley-Appenines | Landing site for Apollo 15 |
| Hasselblad | German camera company which developed and built most of the cameras used in Apollo. The Hasselblad 500 EL was the "moon camera" seen mounted to the chests of the crewmen while on the moon |
| HAW | Call sign letters for Hawaii tracking station |
| HCT | Hand Tool Carrier |
| HEAO | High Energy Astronomy Observatory (satellite) |
| HFE | Heat Flow Experiment, ALSEP experiment |
| HF | high frequency |
| HGA | High Gain Antenna |
| HOTOL | HOrizontal TakeOff and Landing (a proposed SSTO craft) |
| HSK | Call sign letters for Honeysuckle Creek tracking station |
| HST | Hubble Space Telescope |
| hypergolic
(propellant) |
type of rocket fuel (propellant) which explodes when mixed together, thereby not requiring an ignition source |
| Hz | hertz (unit of frequency: 1 cycle per second) |
| IBM | International Business Machines Corporation |
| ICBC | Interagency Committee on Back Contamination |
| ICBM | Intercontinental Ballistic Missile |
| IMU | inertial measurement unit |
| in | inch, inches |
| IR | InfraRed |
| IRAS | InfraRed Astronomical Satellite |
| ISS | International Space Station |
| ITMG | Integrated Thermal Micrometeroroid Garment outside layer of EMU |
| ITT | International Telephone and Telegraph Corporation |
| IU | Instrument Unit (Saturn rocket) |
| IUS | Inertial Upper Stage |
| J | joule |
| JEM | Japanese Experiment Module (for SSF) |
| JPL | Jet Propulsion Laboratory |
| JSC | Johnson Space Center (Manned Spacecraft Center before February 1973) |
| K | Kelvin scale, kelvin(s) |
| kg | kilogram, kilograms |
| km | kilometer(s) |
| km/hrs | kilometers per hour |
| Korou | in French Guiana, French space center - site of all Ariane launches |
| Krechet | Soviet lunar surface EMU |
| KSC | Kennedy Space Center |
| L | Lagrange (as in Lagrange points L1 through L5) |
| LACE | Lunar Atmospheric Composition Experiment unique ALSEP experiment flown only on Apollo 17 |
| LaRC | Langley Research Center |
| lb(s) | pound(s) |
| LC | Launch Complex |
| LCG | Liquid Cooling Garment |
| LCRU | Lunar Communications Relay Unit |
| LDEF | Long Duration Exposure Facility (Shuttle) |
| LEAM | Lunar Ejecta and Meteorites unique ALSEP experiment flown only on Apollo 17 |
| LEC | Lunar Equipment Conveyor cable used to transport equipment to and from the LM cabin to the lunar surface |
| LEM | lunar excursion module |
| LEO | Low Earth Orbit |
| LeRC | Lewis Research Center |
| LES/LET | LES Launch escape system/Launch escape tower |
| LEV | LEV Launch escape vehicle |
| LEVA | Lunar Extravehicular Visor Assembly |
| LGA | Low Gain Antenna |
| LGI | lunar geology investigation |
| LH | Liquid Hydrogen (also LH2 or LHX) |
| LiOH | Lithium Hydroxide chemical used to scrub CO2 from spacecraft or EMU atmosphere |
| LION | Lunar International Observer Network |
| LK | Lunniy Korabl Soviet lunar module |
| LLRF | Lunar Landing Research Facility |
| LLTV | lunar landing training vehicle |
| LM | Lunar Module |
| LM Quad or Bay | 4 triangular shaped sections of LM descent stage, used to carry lunar surface equipment |
| LMP | lunar module pilot |
| LMS | lunar module simulator |
| LMSS | lunar mapping and survey system |
| LN2 | Liquid N2 (Nitrogen) |
| LOC | Launch Operations Center |
| LOI | lunar orbit insertion |
| LOK | Lunniy Orbitalniy Korabl Soviet version of the Apollo CSM, basically a souped up Soyuz spacecraft |
| LOLA | lunar orbit and landing approach |
| LOX | liquid oxygen |
| LRL | Lunar Receiving Laboratory |
| LRRR or LR3 or LR Cubed | Laser Ranging Retroreflector ALSEP/EASEP experiment |
| LRV | lunar roving vehicle |
| LSCRD | Lunar Surface Cosmic Ray Detector ALSEP experiment. Also see CRD |
| LSG | Lunar Surface Gravimeter unique ALSEP experiment flown only on Apollo 17 |
| LSI | Lunar Science Institute |
| LSM | Lunar Surface Magnetometer ALSEP experiment. Also see Portable Magnetometer |
| LTA | LEM test article |
| LSP | Lunar Seismic Profiling - Unique ALSEP experiment flown only on Apollo 17 |
| LTV | Ling-Temco-Vought |
| Lunar | of or about the moon |
| Lunar Orbiter | U.S. series of unmanned probes, mapped the moon from lunar orbit |
| m | m - meter, meter(s) |
| M&SS | Mapping and survey system |
| MA | Mercury Atlas |
| MAD | Call sign letters for Madrid tracking station, also cold war term for "Mutually Assured Destruction" |
| Magnetometer | device used to read the strength of a magnetic field |
| Mariner | U.S. series of unmanned probes, explored Mercury, Venus, and Mars |
| mascons | mass concentrations of dense material on lunar surface |
| MC | megacycles |
| MCC (H) (K) | Mission Control Center (Houston) (Kennedy) |
| MCP | mission control programmer |
| MCR | master change record |
| MDA | Multiple Docking Adapter (Skylab) |
| MDF | mild detonating fuse |
| MDOP | maximum design operating pressure |
| MECO | Main Engine CutOff |
| Mercury | First U.S. manned space program |
| MESA | Modularized Equipment Stowage Assembly - large equipment pallet located in Quad IV of the LM descent stage |
| MET | mobile equipment transporter |
| MeV | million electron volts |
| MGS | Mars Global Surveyor |
| MHz | megahertz (million cycles per second) |
| mi | mile, miles |
| min | minute(s) |
| Mir | Soviet/Russian 3rd generation space station |
| MIT | Massachusetts Institute of Technology |
| mm | millimeter |
| MMH | monomethylhydrazine |
| MOL | Manned Orbiting Laboratory |
| MPA | Mortar Package Assembly - ALSEP experiment |
| MPL | Mars Polar Lander |
| MQF | Mobile Quarantine Facility - silver trailer used on board Apollo recovery ships to isolate returning crews |
| MR | Mercury Redstone |
| MRB | Material Review Board |
| MSC | Manned Spacecraft Center (became Johnson Space Center February 1973) |
| MSF | Manned Space Flight |
| MSFC | Marshall Space Flight Center |
| MSFN | Manned Space Flight Network |
| MSOB | Manned Spacecraft Operations Building |
| Mw | megawatt(s) |
| N-1 Nositel | Soviet manned lunar launch vehicle, G Class |
| N2O4 | Nitrogen Tetroxide - hypergolic propellant |
| NAA | North American Aviation, Inc. (until Sept. 22, 1967) |
| NACA | National Advisory Committee for Aeronautics |
| NAR | North American Rockwell Corporation (Sept. 22, 1967-Feb. 16, 1973; then Rockwell International Corporation) |
| NAS | NAS National Academy of Sciences |
| NASA | National Aeronautics and Space Administration |
| NASDA | NAtional Space Development Agency (Japan) |
| NASM | National Air and Space Museum, Smithsonian Institution |
| NASP | National AeroSpace Plane - SSTO concept. cancelled |
| NEAR | Near Earth Asteroid Rendezvous (now named NEAR Shoemaker) |
| NERVA | Nuclear Engine for Rocket Vehicle Application |
| Neutron Probe | Unique ALSEP experiment flown only on Apollo 17 |
| NGC | New General Catalog |
| NGST | Next Generation Space Telescope |
| NIR | Near InfraRed |
| nm | nautical mile(s) |
| NORAD | NORth American aerospace Defense |
| NR | North American Rockwell Corporation (North American Aviation, Inc., before Sept. |
| NRO | National Reconnaissance Office |
| NSA | National Security Agency |
| NSF | National Science Foundation |
| NSSDC | National Space Science Data Center |
| OAO | Orbiting Astronomical Observatory (satellite) |
| OART | Office of Advanced Research and Technology, NASA Headquarters |
| OAS | optical alignment sights |
| Ocean of Storms | Oceanus Procellarum - Landing site for Apollo 12 |
| OCP | Operational Checkout Procedure |
| Omega Chronograph | Apollo "moon watch" |
| OMS | Orbital Maneuvering System (Shuttle) |
| OMSF | Office of Manned Space Flight, NASA HQ |
| OPF | Orbiter Processing Facility |
| OPS | oxygen purge system |
| ORDEAL | orbital rate drive electronics for Apollo and LM |
| ORI | Operational readiness inspection |
| Orlan | Russian/Soviet EMU adapted from Krechet suit, used on Salyut, Mir and ISS |
| OSC | Orbital Sciences Corporation |
| OSO | Orbiting Solar Observatory (satellite) |
| OSSA | Office of Space Science and Applications, NASA Headquarters |
| OTA | Optical Telescope Assembly (on HST) |
| OTDA | Office of Tracking and Data Acquisition, NASA Headquarters |
| OV | Orbital Vehicle (Shuttle) |
| PAD | project approval document |
| PAM | Payload Assist Module |
| PAM-D | Payload Assist Module, Delta-class |
| PDR | Preliminary Design Review |
| PGA | Pressure garment assembly |
| PHS | Public Health Service |
| PI | principal investigator |
| PIB | Pyrotechnic Installation Building |
| Pioneer | U.S. series of unmanned probes, explored Venus, Jupiter and Saturn |
| PLSS | Portable Life Support System, pronounced PLISS |
| PLSS Tool Carrier Harness | Harness used to attach various tools and a sample bag to the PLSS |
| PM | Pressurized Module |
| PMA | Pressurized Mating Adapter (ISS) |
| PMC | Permanently Manned Capability |
| pogo | launch vehicle induced oscillations (not an acronym; derived from "pogo stick" analogy |
| Polyus | Russian orbital space weapon platform, flew on 1st Energiya flight. Falied to reach orbit |
| Portable Magnetometer | Portable version of magnetometer, carried on the Apollo 14 MET and the Apollo 16 LRV. Also see LSM |
| Proton | Russian/Soviet launch vehicle used to loft the Zond spacecraft, Salyut space stations, Mir space station components, and large satellites |
| PSAC | Presidents Scientific Advisory Committee |
| PSE | Passive Seismic Experiment ALSEP experiment designed to measure "moon quakes" |
| PSEP | Passive Seismic Experiment Package self-contained EASEP version of the PSE |
| psi | pounds per square inch |
| psia | pounds per square inch absolute |
| PTV | parachute test vehicle |
| PV | Photovoltaic |
| PVO | Pioneer Venus Orbiter |
| Ranger | U.S. series of unmanned probes, explored the moon on flyby missions |
| RASPO | Resident Apollo Spacecraft Program Office |
| RCA | Radio Corporation of America |
| RCS | reaction control system |
| RCU | Remote Control Unit - chest mounted system used to control EMU and PLSS while on lunar EVA |
| Red Apple | Handle of EMU pressure relief valve |
| RF | radio frequency |
| RLV | Reusable Launch Vehicle (USAF) |
| RMS | Remote Manipulator System - robotic "Canadarm" used on the Shuttle, precursor to SSRMS |
| Rockwell International Corporation | Rockwell International Corporation) |
| RTCC | Real Time Computer Complex |
| RTG | radioisotope thermoelectric generator |
| RTLS | Return To Launch Site (Shuttle abort plan) |
| RTV | room temperature vulcanizing |
| S/C | spacecraft |
| Salyut | First generation Soviet manned space station program |
| SAMSO | Space and Missiles Organization, Air Force |
| SAR | Synthetic Aperture Radar |
| Saturn | Class of Apollo manned launch vehicles |
| Saturn 1B | smaller of 2 Apollo manned launch vehicles, used to launch spacecraft to earth orbit |
| Saturn V | larger of 2 Apollo manned launch vehicles, used to launch spacecraft to the moon and to launch the Skylab OWS into earth orbit |
| S-Band | radio frequency from 1.55 ghz through to 3.9 ghz |
| SBS | Satellite Business Systems |
| SCA | Shuttle Carrier Aircraft |
| SCB | Sample Collection Bag - Teflon bags used to return lunar samples to earth |
| Sea of Tranquility | Mare Tranquilitatis - Landing site for Apollo 11 |
| SEB | Source Evaluation Board |
| sec | second(s) |
| SEP or sep | Surface Electrical Properties - ALSEP experiment on Apollo 17. Also, abbreviation for separation as in "sep burn" |
| SEQ | scientific equipment |
| SEQ Bay | LM descent stage Quad II, carried ALSEP experiments pallets |
| SESC | Special Environmental Sample Container |
| SESL | Space Environmental Simulation Laboratory |
| SEVA | Stand-up extravehicular activity |
| S-IB | Saturn IB launch vehicle first stage |
| S-IC | Saturn V launch vehicle first stage |
| SID | Space and Information Systems Division (NAA) |
| SIDE | Suprathermal Ion Detector - ALSEP experiment |
| S-II | Saturn second stage |
| SIM | scientific instrument module |
| SIM Bay | Scientific Equipment Module Bay - sector of Apollo SM used on J-series missions to house a suite of experiments and mapping cameras |
| S-IVB | Saturn IB second stage; Saturn V third stage |
| Skylab | First U.S. space station |
| SLA | spacecraft-lunar module adapter |
| SLSS | supplementary life support system |
| SM | Service module |
| Soyuz | Soviet/Russian manned space vehicle used in earth orbital missions. This S/C has been in use since 1967 |
| Space Shuttle | Spacecraft used to transport manned crews to and from earth orbit |
| SPF | single point failure |
| SPK/YMK | Soviet version of U.S. Manned Manuevering Unit |
| SPS | service propulsion system |
| sq cm | square centimeter(s) |
| sq m | square meter, square meters |
| SRC | Sample Return Container |
| SSC | space suit communications |
| STAG | Scientific and Technical Advisory Committee, university-NASA |
| STG | Space Task Group, NASA (forerunner of Manned Spacecraft Center); Space Task Group, President's (1969) |
| STL | STL - Space Technology Laboratories, Inc. |
| STS | Space Transportation System, aka the Space shuttle |
| Sublimator | Cooling system used on manned spacecraft and space suits |
| SWC | Solar Wind Collector - foil sheet used to trap solar particles, ALSEP experiment |
| SWIP | Super Weight Improvement Program |
| SWS | Solar Wind Spectrometer, ALSEP experiment |
| Taurus-Littrow | Landing site for Apollo 17 |
| TCP | test and checkout procedures |
| TCU | Television Control Unit |
| TEI | transearth injection (insertion into trajectory to earth) |
| TLI | translunar injection (insertion into trajectory to moon) |
| TLSA | Torso Limb Suit Assembly |
| TM | test model |
| Traverse Gravimeter | Rover mounted ALSEP experiment used on Apollo 17 |
| TV | thermal vacuum-test article; also television |
| U.S. | United States of America |
| U.S.S.R. | Union of Soviet Socialist Republics |
| UHT | Universal Hand Tool |
| UTCA | Urine Collection and Transfer Assembly |
| V | volt(s) |
| VHF | Very high frequency |
| Zond | Soviet manned lunar orbital program, also the name used for several unmanned probes |