ALHT: Apollo Lunar Hand Tools

ALSCC: Apollo Lunar Surface Close-Up Camera, also known as the Gold Camera after its developer, astronomer Tommy Gold

ALSEP: Apollo Lunar Surface Experiments Package; collection of experiments flown to the lunar surface by Apollo 12, 14, 15, 16, and 17

AMU: Astronaut Maneuvering Unit

AOS: Acquisition Of Signal

ASE: Active Seismic Experiment; part of the ALSEP instrumentation flown on Apollo 14 and 16

CAPCOM: Spacecraft Communicator

CCIG: Cold Cathode Ion Gauge experiment; was part of the ALSEP instrumentation flown on Apollo 12, 14, and 15

CDR: Commander

CM: Command Module

CMP: Command Module Pilot

CO2: Carbon Dioxyde

CP: Command Pilot or Control Point

CRD: Cosmic Ray Detector; flown on Apollo 16 and 17

CSM: Command and Service Module

CSQ: Call sign of NASA tracking ship Coastal Sentry Quebec

CSRC: Contingency Sample Return Container

DAC: Digital to Analog Converter or Data Acquisition Camera

Dixie Cup: This nickname refers to the cup-shaped, individual sample bags that were used on Apollo 12, 14, and 17

DOI: Descent Orbit Insertion

DPS: Descent Propulsion System

EASEP: Early Apollo Surface Experiment Package; collection of experiments flown on Apollo 11; see ASE and LRRR

ECS: Environmental Control System

EMU: Extravehicular Mobility Unit; Space Suit and Backpack combination

ETB: Equipment Transfer Bag

EVA: Extravehicular Activity

FDO or FIDO: Flight Dynamics Officer

GET: Ground-Elapsed Time

Gnomon: A tool that consists of a weighted staff suspended on a two-ring gimbal and supported by a tripod. The staff extends 12 inches above the gimbal and is painted with a gray scale. The gnomon is used as a photographic reference to indicate local vertical, sun angle, and scale.

HCEX: Highspeed Color Ektachrome Film

HEDC: Hasselblad Electric Data Camera

HFE: Heat Flow Experiment or Heat Flow Electronics; part of the ALSEP instrumentation flown on Apollo 15, 16, and 17

HQ: (NASA) Headquarters

IGN: Ignition

IVA: Intravehicular Activity

JETT: Jettison

JPL: Jet Propulsion Laboratory

KSC: Kennedy Space Center

LACE: Lunar Atmospheric Composition Experiment; part of the ALSEP instrumentation flown on Apollo 17

LAD: Lunar Atmosphere Detector

LCRU: Lunar Communications Relay Unit

LDD: Lunar Dust Detector; part of the ALSEP instrumentation flown on Apollo 12, 14, and 15

LDG: Landing

LEB: Lower Equipment Bay

LEC: Lunar Equipment Conveyor

LEVA: Lunar Extravehicular Visor Assembly; a polycarbonate shell and two visors with thermal control and optical coatings on them

LiOH: Lithium Hydroxide

LLTV: Lunar Landing Training Vehicle

LM: Lunar Module

LMP: Lunar Module Pilot

LMS: Lunar Mass Spectrometer

LNP: Lunar Neutron Probe (experiment); flown on Apollo 17

LOI: Lunar Orbit Insertion

LOS: Loss Of Signal

LPI: Lunar and Planetary Institute

LPM: Lunar Portable Magnetometer; flown on Apollo 14 and 16

LRC: (NASA) Langley Research Center

LRL: Lunar Receiving Laboratory

LRRR, LR Cubed, or LR3: Lunar Ranging Retro-Reflector; flown on Apollo 11, 14, and 15

LRV: Lunar Roving Vehicle or Lunar Rover; flown on Apollo 15, 16, and 17

LSG: Lunar Surface Gravimeter; part of the ALSEP instrumentation flown on Apollo 17

LSM: Lunar Surface Magnetometer; part of the ALSEP instrumentation flown on Apollo 12, 15, and 16

LTG: Lunar Traverse Gravimeter (experiment); flown on Apollo 17

MAG: Magazine

MCC: Mission Control Center or MidCourse Correction

MCCH: Mission Control Center Houston

MESA: Modular Equipment Stowage Assembly

MET: Mission Elapsed Time, Mission Event Timer, or Mobile Equipment Transporter or Modular Equipment Transporter. The Apollo 14 transporter was a two-wheeled rickshaw vehicle used to carry tools, containers, spare film, etc.

MSFC: (NASA) Marshall Spaceflight Center

MOCR: Mission Operations Control Room

MPA: Mortar Pack Assembly

MSC: (NASA) Manned Spacecraft Center; now Johnson Space Center

MSFN: Manned Space Flight Network; provides reliable, (usually) continuous, and instantaneous radio communications with the astronauts, launch vehicle, and spacecraft from lift-off to splashdown

MSOB: Manned Spacecraft Operations Building at the Kennedy Space Center

NASA: National Aeronautics and Space Administration

NAV: Navigation

O2: Oxygen

OPS: Oxygen Purge System

PAD: Preliminary Advisory Data: the crew had pre-printed forms on which they could write lift-off times and other data they would need in the event that communications was lost with Houston. Before and after each rest period, the CapCom would read up a list of lift-off times covering the next 10 to 12 hours and, prior to launch, a longer list of data was read up

PAO: Public Affairs Office or Public Affairs Officer

PDI: Powered Descent Initiation

PLSS: Portable Life Support System

Plus Y axis: North side of the LM

Plus Z axis: West side of the LM

POGO: Partial Gravity Simulator

PPK: Personal Preference Kits

PSE(P): Passive Seismic Experiment (Package); part of the ALSEP instrumentation flown on Apollo 11, 12, 14, 15, and 16

PTC: Passive Thermal Control; also known as the Barbecue mode, in which the LM/CSM stack was oriented with its long axis perpendicular to the Sun so that, when the spacecraft were put into a slow rotation around that axis, heating and cooling would be relatively uniform.

PYRO: Pyrotechnic

QUAD: Quadrant

RCS: Reaction Control System

RCU: Remote Control Unit

REACQ: Re-acquire

Reseau Plate: A glass plate fitted close to the film plane in the lunar surface Hasselblads

RTG: Radioisotopic Thermoelectric Generator; used to provide power to the ALSEP experiments flown on Apollo 12, 14, 15, 16, and 17

S/C: Spacecraft

SCB: Sample Collection Bag

SEB: Scientific Equipment Bay

SEC: Special Environmental Container; the container when sealed will retain a high vacuum for study of lunar samples in its original environment

SEQ: Sequence or Scientific Equipment Bay

SIDE: Suprathermal Ion Detection Experiment; part of the ALSEP instrumentation flown on Apollo 12, 14, and 15

SIM: Scientific Instrument Module

SLA: Spacecraft Launch Adapter or SM/LM Adapter

SM: Service Module

SPS: Service Propulsion System

SRC: Sample Return Container; the rock boxes

SWC: Solar Wind Composition Collector; flown on Apollo 11, 12, 14, 15, and 16

SWS: Solar Wind Spectrometer; part of the ALSEP instrumentation flown on Apollo 12 and 15

TEC: Transearth Coast

TEI: Transearth Injection

T/G: Thumper/Geophone Experiment

TGE: Traverse Gravimeter Experiment; flown on Apollo 17

TIG or Tig: Time of Ignition

TLC: Translunar Coast

TLI: Translunar Injection

UVC: Ultraviolet Camera; flown on Apollo 16

VOX: Voice Activated Transmission