Acronyms: °C to AOA

For example, °C means Degrees Celsius. Meanwhile, °F stands for Degrees Fahrenheit. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
°C	Degrees Celsius
°F	Degrees Fahrenheit
°R	Degrees Rankine
24/7	24 Hours/day, 7 days/week
2–D	Two-Dimensional
3C	Command, Control, and Checkout
3–D	Three-Dimensional
3–DOF	Three-Degrees of Freedom
6-DOF	Six-Degrees of Freedom
A&E	Architectural and Engineering
ACEIT	Automated Cost-Estimating Integrated Tools
ACES	Acceptance and Checkout Evaluation System
ACP	Analytical Consistency Plan
ACRN	Assured Crew Return Vehicle
ACRV	Assured Crew Return Vehicle
—	Analog to Digital
ADBS	Advanced Docking Berthing System
ADRA	Atlantic Downrange Recovery Area
AEDC	Arnold Engineering Development Center
AEG	Apollo Entry Guidance
AETB	Alumina Enhanced Thermal Barrier
AFB	Air Force Base
AFE	Aero-assist Flight Experiment
AFPG	Apollo Final Phase Guidance
AFRSI	Advanced Flexible Reusable Surface Insulation
AFV	Anti-Flood Valve
AIAA	American Institute of Aeronautics and Astronautics
—	Aluminum
ALARA	As Low As Reasonably Achievable
AL-Li	Aluminum-Lithium
ALS	Advanced Launch System
ALTV	Approach and Landing Test Vehicle
AMS	Alpha Magnetic Spectrometer
AMSAA	Army Material System Analysis Activity
AOA	Analysis of Alternatives

Space terms: AOD to C&W

Next, explore the acronyms in this part of the glossary.

For example, AOD means Aircraft Operations Division. Meanwhile, APAS stands for Androgynous Peripheral Attachment System. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
AOD	Aircraft Operations Division
APAS	Androgynous Peripheral Attachment System
APS	Auxiliary Propulsion System
APU	Auxiliary Power Unit
APU	Auxiliary Propulsion Unit
AR&D	Automated Rendezvous and Docking
ARC	Ames Research Center
ARF	Assembly/Remanufacturing Facility
ASE	Airborne Support Equipment
ASI	Augmented Space Igniter
ASTWG	Advanced Spaceport Technology Working Group
ASTP	Advanced Space Transportation Program
—	Alternate Turbopump
ATCO	Ambient Temperature Catalytic Oxidation
ATCS	Active Thermal Control System
ATO	Abort-To-Orbit
ATP	Authority to Proceed
ATS	Access to Space
ATV	Automated Transfer Vehicles
ATV	All Terrain Vehicle
—	Billion(s)
BEN	Benign
BFO	Blood-Forming Organs
BFS	Backup Flight Software
BGN	Benign Failure
BLS	Bureau of Labor Statistics
BMI	Bismaleimide
BOGS	Blade Outer Gas Seal
BPR	Business Process Reengineering
BRCU	Booster Remote Control Unit
BSM	Booster Separation Motor
Btu	British Thermal Unit
—	Carbon
C&C	Command and Control
C&W	Caution and Warning

Acronyms: C.I to Centimeters

For example, C.I means Confidence Interval. Meanwhile, C2H6 stands for Propane. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
C.I	Confidence Interval
C2H6	Propane
C3	Earth Departure Energy
CAD	Computer-Aided Design
CaLV	Cargo Launch Vehicle
CAM	Computer-Aided Manufacturing
CBC	Common Booster Core
CBM	Common Berthing Mechanism
CBT	Computer-Based Training
CCAFS	Cape Canaveral Air Force Station
CCB	Common Core Booster
CCDH	Command, Control, and Data Handling
CDF	Cumulative Distribution Function
CDR	Critical Design Review
CDV	Cargo Delivery Vehicle
CE&R	Concept Exploration and Refinement
CEEF	Crew Escape Effectiveness Factor
CER	Cost Estimating Relationships
CEV	Crew Exploration Vehicle
CFD	Computational Fluid Dynamics
CFF	Catastrophic Failure Fraction
CFM	Cryogenic Fluid Management
CFO	Chief Financial Officer
cg or CG	Center of Gravity
cGy-Eq	Centigray Equivalent
CH4	Methane
CHeCS	Crew Health Care System
CHMO	Chief Health and Medical Officer
CIL	Critical Items List
CIR	Combustion Integrated Rack
—	Confidence Level
ClF5	Chlorine Pentafloride
CLV	Crew Launch Vehicle
CM	Crew Module
—	Centimeters

Space terms: CMG to DSS

Next, explore the acronyms in this part of the glossary.

For example, CMG means Control Moment Gyroscope. Meanwhile, CMRS stands for Carbon Dioxide (CO2) and Moisture Removal System. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
CMG	Control Moment Gyroscope
CMRS	Carbon Dioxide (CO2) and Moisture Removal System
CO2	Carbon Dioxide
COAS	Crew Optical Alignment Sight
Comm	Communication
CONUS	Continental United States
—	Change Request
CRAC	Constant Radius Access Circle
Crit-1	Criticality 1
CRV	Crew Return Vehicle
CSM	Command and Service Module
CTB	Cargo Transfer Bag
CTS	Crew Transportation System
CWI	Combustion Wave Ignition
—	Calendar Year
DARE	Dynamic Abort Risk Evaluator model
DAV	Descent/Ascent Vehicle
DBFRSC	Dual Preburner Fuel Rich Staged Combustion
DCF	Delayed Catastrophic Failure
DCS	Decompression Sickness
DC–X	Delta Clipper Experimental Program
DDCmplx	Design and Development Complexity
DDInher	Design and Development Inheritance
DDT&E	Design, Development, Test, and Evaluation
deg	Degrees
Demo	Demonstration
DKR	Detra-Kemp-Riddell
DoD	Department of Defense
DoE	Department of Energy
DOF	Degrees of Freedom
DoT	Department of Transportation
DPT	Decadel Planning Team
DRM	Design Reference Mission
DSN	Deep Space Network
DSS	Decelerator System Simulation

Acronyms: Delta Velocity (i.e., change in velocity) to EtOH

For example, means Delta Velocity (i.e., change in velocity). Meanwhile, EAC stands for Estimates at Completion. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
—	Delta Velocity (i.e., change in velocity)
EAC	Estimates at Completion
EAFB	Edwards Air Force Base
EAP	Expert Assessment Panel
EAS	Engine Air Start
ECLS	Environmental Control and Life Support
ECLSS	Environmental Control and Life Support System
ECU	Engine Control Unit
EDL	Entry Descent and Landing
EDLS	Entry, Descent, and Landing System
EDS	Earth Departure Stage
EDV	EELV-Derived Vehicle
EEE	Electrical and Electronic Engineering
EELV	Evolved Expendable Launch Vehicle
—	Error Factor
EHA	Electro-Hydrostatic Actuator
—	Entry Interface
EIRA	ESAS Initial Reference Architecture
ELR	Excess Lifetime Risk
ELV	Expendable Launch Vehicle
EMA	Electro-Mechanical Actuators
EMU	Extra-vehicular Maneuvering/Mobility Unit
—	Engine-Out
EOI	Earth-Orbit Insertion
EOR	Earth Orbit Rendezvous
ERT	Expedition Readiness Training
ESA	Exploration Systems Architecture
ESAS	Exploration Systems Architecture Study
ESD	Event Sequence Diagram
ESMD	Exploration Systems Mission Directorate
ESRT	Exploration Systems Research and Technology
eSSME	Expendable Space Shuttle Main Engine
—	External Tank
ETO	Earth-to-Orbit
EtOH	Ethanol

Space terms: EVA to Acceleration due to gravity (32 ft/sec)

Next, explore the acronyms in this part of the glossary.

For example, EVA means Extra-Vehicular Activity. Meanwhile, FAR stands for Federal Acquisition Regulation. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
EVA	Extra-Vehicular Activity
FAR	Federal Acquisition Regulation
—	Flight Computer
FCE	Flight Crew Equipment
FDIR/R	Fault Detection, Isolation, and Recovery/Reconfiguration
FES	Fluid Evaporator System
FEV	Flash Evaporator System
FIR	Fluids Integrated Rack
FIRST	Flight-Oriented Integrated Reliability and Safety Tool
FIV	Fuel Isolation Valve
Flts	Flights
FLUINT	Fluid Integrator
—	Failure Mode
FMC	Flight Medicine Clinic
FMEA	Failure Modes and Effects Analysis
FMHR	Free Molecular Heating Rate
FOM	Figure of Merit
FORP	Fuel-Oxidizer Reaction Product
FRAM	Flight-Releasable Attachment Mechanism
FRGF	Flight-Releasable Grapple Fixture
FRSC	Fuel-Rich Staged Combustion
FRSI	Flexible Reusable Surface Insulation
—	Factor of Safety
FSE	Flight Support Equipment
FSPS	Fission Surface Power System
FSS	Fixed Service Structure
—	Feet
ft/s	Feet Per Second
FTA	Flight Test Article
FTINU	Fault Tolerant Inertial Navigation Unit
FTP	Fuel Turbopump
FTS	Flight Termination System
—	Flight Unit
—	Fiscal Year
—	Acceleration due to gravity (32 ft/sec)

Acronyms: G&A to HHFO

For example, G&A means General and Administrative. Meanwhile, g/cm2 stands for Grams Per Square Centimeter. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
G&A	General and Administrative
g/cm2	Grams Per Square Centimeter
GaAs	Gallium Arsenide
GCH4	Gaseous Methane
GCR	Galactic Cosmic Ray
GDMS	Ground Data Management System
GEM	Graphite Epoxy Motor
GEO	Geosynchronous Earth Orbit
GFE	Government-Furnished Equipment
—	Gas Generator
GHe	Gaseous Helium
GLOW	Gross Liftoff Weight
GN&C	Guidance, Navigation, and Control
GN2	Gaseous Nitrogen
GOX	Gaseous Oxygen
GPS	Global Positioning System
GR&A	Ground Rules and Assumptions
GRAM	Global Reference Atmospheric Model
GRC	Glenn Research Center
GSE	Government-Supplied Equipment
GSE	Ground Support Equipment
GSFC–FAA	Goddard Space Flight Center – Federal Aviation Administration
—	Gemini-Titan
GTO	Geosynchronous Transfer Orbit
H2	Hydrogen
H2O	Water
H2O2	Hydrogen Peroxide
HAC	Heading Alignment Circle
HAN	Hydroxyl Ammonium Nitrate
—	Hazard Division
HDPE	High-Density Polyethylene Shielding
He	Helium
HEO	High Earth Orbit
HEX	Heat Exchanger
HHFO	Habitability and Human Factors Office

Space terms: HIP to IR

Next, explore the acronyms in this part of the glossary.

For example, HIP means Hot Isostatic Press. Meanwhile, HLLV stands for Heavy-Lift Launch Vehicle. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
HIP	Hot Isostatic Press
HLLV	Heavy-Lift Launch Vehicle
HLR	Human Lunar Return
HLV	Heavy-Lift Vehicle
HPFTP	High-Pressure Fuel Turbopump
HPFTP/AT	High-Pressure Fuel Turbopump/Alternate Turbopump
HPOTP/AT	High-Pressure Oxidizer Turbopump/Alternate Turbopump
HPU	Hydraulic Power Unit
—	Headquarters
HSRT	Human Systems Research and Technology
HST	Hubble Space Telescope
HTPB	Hydroxyl Terminated Poly-Butadiene
HTV	H-11 Transfer Vehicle
—	Habitable Volume
HVAC	Heating, Ventilating, and Air Conditioning
HYPAS	Hybrid Predictive Aerobraking Scheme
I&T	Integration and Test
I/F	Interface
IA&C	Integration, Assembly, and Checkout
ICD	Interface Control Document
ICF	Instantaneous Catastrophic Failure
IDT	Integrated Discipline Team
ILC	In-Line Configuration
ILC	Integrated Logistics Concepts
IMLEO	Initial Mass in Low Earth Orbit
IMP	Integrated Mission Program
IMS	Integrated Master Schedule
IMU	Inertial Measuring Unit
—	Inch(es)
INS	Inertial Navigation System
INTROS	Integrated Rocket Sizing Program
IOC	Initial Operational Capability
IPAO	Independent Program Assessment Office
IPD	Integrated Powerhead Demonstrator
IR	Infrared

Acronyms: IRD to LaRC

For example, IRD means Interface Requirements Document. Meanwhile, stands for Interstages. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
IRD	Interface Requirements Document
—	Interstages
ISHM	Integrated Systems Health Management
Isp	Specific Impulse
ISPP	In-Situ Produced Propellant
ISRU	In-Situ Resource Utilization
ISS	International Space Station
—	Information Technology
ITA	Internal Task Agreement
ITAR	International Traffic and Arms Regulations
IVA	Intra-Vehicular Activity
IVHM	Integrated Vehicle Health Management
JOFOC	Justification for Other Than Full and Open Competition
JSC	Johnson Space Center
JWST	James Webb Space Telescope
—	Thousands
—	Kelvin
—	Kilograms
—	Kilojoule
klb	Kilopound
klbf	Thousand Pounds Force
—	Kilometers
km/s	Kilometers Per Second
kN	Kilonewtons
kPa	Kilopascals
KPP	Key Performance Parameters
KSC	Kennedy Space Center
KSLOC	Thousand Software Lines of Codes
kWe	Kilowatts Electric
L/D	Lift-to-Drag (ratio)
LAD	Liquid Acquisition Device
LADAR	Laser Detection and Ranging
LAN	Local Area Network
LAN	Longitude of Ascending Node
LaRC	Langley Research Center

Space terms: LAS to LRB

Next, explore the acronyms in this part of the glossary.

For example, LAS means Launch Abort System. Meanwhile, stands for Pound(s). Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
LAS	Launch Abort System
—	Pound(s)
lbf	Pounds Force
lbm	Pounds Mass
—	Launch Complex
LCC	Life Cycle Cost
LCF	Low Cycle Fatigue
LCH4	Liquid Methane
LCVG	Liquid Cooled Ventilation Garment
LCX	Launch Complex X
LEAG	Lunar Exploration and Analysis Group
LEM	Lunar Excursion Module
LEO	Low Earth Orbit
LES	Launch Escape System
LExSWG	Lunar Exploration Science Working Group
LH2	Liquid Hydrogen
Li	Lithium
LiDAR	Light Detection and Ranging
LIDS	Low-Impact Docking System
LiOH	Lithium Hydroxide
LLO	Low Lunar Orbit
LLV	Lunar Launch Vehicle
LM	Lunar Module
LNG	Liquid Natural Gas
LOC	Loss of Crew
LOI	Lunar-Orbit Insertion
LOM	Loss of Mission
LOR	Lunar Orbit Rendezvous
LOV	Loss of Vehicle
LOX	Liquid Oxygen
LPFTP/AT	Low-Pressure Fuel Turbopump/Alternate Turbopump
LPOTP/AT	Low-Pressure Oxidizer Turbopump/Alternate Turbopump
LPR	Libration Point Rendezvous
LPRE	Lunar Polar Resource Extractor
LRB	Liquid Rocket Booster

Acronyms: LRECM to MET

For example, LRECM means Liquid Rocket Engine Cost Model. Meanwhile, LRO stands for Lunar Reconnaissance Orbiter. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
LRECM	Liquid Rocket Engine Cost Model
LRO	Lunar Reconnaissance Orbiter
LRPS	Lunar Radioisotope Power System
LRU	Line Replaceable Unit
LRV	Lunar Roving Vehicle
LSAM	Lunar Surface Access Module
LSC	Launch Services Contractor
LSR	Lunar Surface Rendezvous
LTMCC	Large-Throat Main Combustion Chamber
LUT	Launch Umbilical Tower
—	Launch Vehicle
LVA	Launch Vehicle Architecture
LVHM	Launch Vehicle Health Management
—	Million(s)
—	Meters
M&O	Maintenance and Operations
M&P	Material and Processing
m/s	Meters Per Second
m3	Cubic Meters
—	Mercury-Atlas
MAF	Michoud Assembly Facility
mbo	Stage Burnout Mass
MCC	Main Combustion Chamber
MCC	Mission Control Center
mdry	Stage Dry Mass
MDU	Master Data Unit
ME	Main Engine
MEA	Maintenance Engineering Analysis
MECO	Main Engine Cutoff
MEIT	Multi-Element Integrated Test
MEOP	Maximum Expected Operating Pressure
MEPAG	Mars Exploration Program Analysis Group
MER	Mass Estimating Relationship
MER	Mars Exploration Rover
MET	Mission Elapsed Time

Space terms: MeVs to N2O

Next, explore the acronyms in this part of the glossary.

For example, MeVs means Millions of Electron Volts. Meanwhile, MFBF stands for Mean Flights Between Failure. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
MeVs	Millions of Electron Volts
MFBF	Mean Flights Between Failure
mgross	Stage Gross Liftoff Mass
mgross-veh	Vehicle Gross Liftoff Mass
MIS	Management Information System
MIT	Massachusetts Institute of Technology
MLE	Mid-deck Locker Equivalent
MLI	Multilayer Insulation
MLP	Mobile Launch Platform
MLUT	Mobile Launch Umbilical Tower
MLV	Medium-Lift Vehicle
—	Mission Mode
MMH	Monomethyl Hydrazine
MMOD	Micrometeoroid/Orbital Debris
MMSSG	Moon-Mars Science Linkage Steering Group
MON-3	Multiple Oxides of Nitrogen – 3%
MPK	Mission Peculiar Kit
MPPF	Multi-Purpose Processing Facility
MPS	Main Propulsion System
MPTA	Main Propulsion Test Article
—	Mercury-Redstone
—	Microsoft®
MSFC	Marshall Space Flight Center
MSL	Mars Science Laboratory
MSS	Mobile Service Structure
mT	metric ton(s)
MTBF	Mean Time Between Failure
MTV	Mars Transfer Vehicle
MUSS	Multi-User System and Support
MWe	Megawatts Electric
—	Newtons
N/A	Not Applicable
N2	Nitrogen
N2H4	Hydrazine
N2O	Nitrous Oxide

Acronyms: NAFCOM to ORSC

For example, NAFCOM means NASA and Air Force Cost Model. Meanwhile, NAS stands for National Academy of Sciences. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
NAFCOM	NASA and Air Force Cost Model
NAS	National Academy of Sciences
NASA	National Aeronautics and Space Administration
Nav	Navigation
NBL	Neutral Buoyancy Laboratory
NCRP	National Council on Radiation Protection and Measurements
NEO	No Engine-Out
NEPA	National Environmental Policy Act
NExT	NASA Exploration Team
NGLT	Next Generation Launch Technology
NHRP	Next Hop Resolution Protocol
nmi	nautical mile
NPD	NASA Program Directive
NPG	NASA Procedure and Guideline
NPOE	NPO Energomash
NPR	NASA Procedural Requirements
NRO	National Reconnaissance Office
NSI	NASA Standard Initiative/Initiator
NTO	Nitrogen Tetroxide
NTP	Nuclear Thermal Propulsion
NTS	Nevada Test Sites
NUREG	Nuclear Regulatory Commission
O&C	Operations and Checkout
O&M	Operations and Maintenance
O2	Oxygen
OBC	Other Burden Costs
OCM	Operations Cost Model
OExP	Office of Exploration
OMB	Office of Management and Budget
OML	Outer Mold Line
OMS	Orbital Maneuvering System
OODA	Observation, Orientation, Decision, Action
Ops	Operations
ORCA	Ordnance Remote Control Assembly
ORSC	Oxygen-Rich Staged Combustion

Space terms: ORU to Primary and Secondary

Next, explore the acronyms in this part of the glossary.

For example, ORU means Orbital Replacement Unit. Meanwhile, OSP stands for Orbital Space Plane. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
ORU	Orbital Replacement Unit
OSP	Orbital Space Plane
OTP	Oxygen Turbopump
P	Pressure Transducer
P(LOC)	Probability of Loss of Crew
P(LOM)	Probability of Loss of Mission
P/C	Probe and Cone
—	Pad Abort
PAO	Public Affairs Office
PAS	Primary Ascent System
PAS	Payload Attach System
PBAN	Polybutadiene Acrylonitride
—	Plane Change
—	Personal Computer
PCBM	Passive Common Berthing Mechanism
PCM	Pulse Code Modulated
PCM	Pressurized Cargo Mission
PCU	Power Control Unit
PDR	Preliminary Design Review
PEG	Powered Explicit Guidance
PEM	Proton Exchange Membrane
PIC	Pyrotechnic Initiator Controller
PICA	Phenolic Impregnated Carbonaceous Ablator
PLF	Payload Fairing
PMA	Pressurized Mating Adapter
PMA	Primary Mating Adapter
PMAD	Power Management and Distribution
PMS	Propulsion Management System
PNST	Prometheus Nuclear Systems Technology
POD	Point of Departure
POST	Program to Optimize Simulated Trajectories
ppm	Parts Per Million
PRA	Probabilistic Reliability Assessment
PRC	Productivity Rate Curve
—	Primary and Secondary

Acronyms: psf to RSS

For example, psf means pounds per square foot. Meanwhile, psi stands for Pounds Per Square Inch. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
psf	pounds per square foot
psi	Pounds Per Square Inch
psia	Pounds Per Square Inch Absolute
PTA	Prototype Test Article
—	Photovoltaic
—	Pressurized Volume
PV/RFC	Photovoltaic/Regenerative Fuel Cell
PV/W	Formula: (Pressure ∙ Volume)/Weight
—	Quantity Distance
QRAS	Quantitative Risk Assessment System
R&D	Research and Development
R&T	Research and Technology
RAAN	Right Ascension of Ascending Node
RCC	Reinforced Carbon-Carbon
RCG	Reaction-Cured Glass
RCRS	Regenerative CO2 Removal System
RCS	Reaction Control System
RDU	Remote Data Unit
REID	Risk of Exposure-Induced Death
—	Radio Frequency
RFC	Regenerative Fuel Cell
RFP	Request for Proposals
RLEP	Robotic Lunar Exploration Program
RMS	Remote Manipulator System
ROM	Rough Order Magnitude
ROW	Risks, Opportunities, and Watches
—	Rocket Propellant
RP1	Kerosene
RPCU	Remote Power Control Unit
RPL	Rated Power Level
RPSF	Rotation Processing and Surge Facility
RRF	Risk Reduction Flight
RRGU	Redundant Rate Gyro Unit
RSRB	Reusable Solid Rocket Booster
RSS	Rotating Service Structure

Space terms: RTV to SOA

Next, explore the acronyms in this part of the glossary.

For example, RTV means Room Temperature Vulcanized. Meanwhile, S&A stands for Safe and Arm. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
RTV	Room Temperature Vulcanized
S&A	Safe and Arm
S&MA	Safety and Mission Assurance
SAIC	Science Applications International Corporation
SARSAT	Search and Rescue Satellite-aided Tracking
SBIR	Small Business Innovation Research
SCAPE	Self-Contained Atmospheric Protection Ensembles
SCAWG	Space Communications Architecture Working Group
SCBA	Strip Collar Bonding Approach
SCE	Station Control Electronics
SDILV	Shuttle-Derived In-line Launch Vehicle
SDLV	Shuttle-Derived Launch Vehicle
SDV	Shuttle-Derived Vehicle
SE&I	Systems Engineering and Integration
sec	Second(s)
SECO	Second Stage Engine Cutoff
SEER–SEM	SEER Software Estimation Model
SEG	Space Shuttle Entry Guidance
SEI	Space Exploration Initiative
SFT	Single Fault Toerant
SHAB	Surface Habitat
SiC	Silicon Carbon
SIGI	Space Integrated GPS Instrumentation
SII	Saturn Second Stage
SINDA	Systems Improved Numerical Differencing Analyser
SIP	Strain Isolation Pad
SIRCA	Silicon Infused Reusable Ceramic Ablator
SIVB	Saturn V Third Stage
SLF	Shuttle Landing Facility
SLI	Space Launch Initiative
SLOC	Software Lines of Code
—	Service Module
SMAC	Spacecraft Maximum Allowable Concentration
SMD	Science Missions Directorate
SOA	State-of-the-Art

Acronyms: SOFI to Software

For example, SOFI means Spray-On Foam Insulation. Meanwhile, SOMD stands for Space Operations Missions Directorate. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
SOFI	Spray-On Foam Insulation
SOMD	Space Operations Missions Directorate
SOMS	Shuttle Orbiter Medical System
SORT	Simulation and Optimization of Rocket Trajectories
SPA	Spacecraft/Payload Adapter
SPA	South Pole-Aitken (basin on the Moon)
SPACE	Screening Program for Architecture Capability Evaluation
SPASE	Standardized Propulsive Skip Entry
SPE	Solar Particle Event
SPF	Single Point Failure
SPS	Service Propulsion System
SPST	Space Propulsion Synergy Team
SRB	Solid Rocket Booster
SRM	Solid Rocket Motor
SRR	System Requirements Review
SSC	Stennis Space Center
SS–LV	Single-Stick Launch Vehicle
SSME	Space Shuttle Main Engine
SSP	Space Shuttle Program
SSPF	Space Station Processing Facility
SSRMS	Space Station Remote Manipulator System
SSTO	Single-Stage-to-Orbit
STA	Static Test Article
STA	Structural Test Article
STD	Standard
stg	Stage
STH	System Test Hardware
STO	System Test Operations
STPPO	Space Transportation Programs and Projects Office
STS	Space Transportation System
STTR	Small Business Technology Transfer
SUF	Startup Failure
—	Space Vehicle
SVMF	Space Vehicle Mockup Facility
—	Software

Space terms: T/W to VITT

Next, explore the acronyms in this part of the glossary.

For example, T/W means Thrust-to-Weight (ratio). Meanwhile, TAL stands for Trans-Atlantic Abort Landing. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
T/W	Thrust-to-Weight (ratio)
TAL	Trans-Atlantic Abort Landing
TBD	To Be Determined
TBR	To Be Resolved
—	Thermocouple
TCA	Thrust Chamber Assembly
TCS	Thermal Control System
TDRSS	Tracking and Data Relay Satellite System
TEI	Trans-Earth Injection
TEP/ODE	Thermal Equilibrium Program/One Dimensional Equilibrium
TFU	Theoretical First Unit
TIFF	Throttle-Insensitivity Failure Fraction
TLI	Trans-Lunar Injection
TNT	Trinitrotoluene, i.e., CH3C6H2(NO2)3
TPS	Thermal Protection System
TPSX	Thermal Protection System Expert
TRL	Technology Readiness Level
Tt 1/2	Test Type 1, Test Type 2
—	Television
TVC	Thrust Vector Control
TVS	Thermal Vacuum Stability
U.S	United States
UCA	Undefinitized Contract Actions
UCM	Unpressurized Cargo Mission
UHF	Ultrahigh Frequency
URCU	Upper Stage Remote Control Unit
—	Upper Stage
USAF	United States Air Force
USOS	United States On-orbit Segment
—	Ultra-Violet
VAB	Vehicle Assembly Building
VDC	Volts Direct Current
VIPA	Vehicle Integrated Performance Analysis Team
VITO	Vehicle Integration and Test Office
VITT	Vehicle Integrated Test Team

Acronyms: Vacuum Perigee to ΔV

For example, means Vacuum Perigee. Meanwhile, VPF stands for Vertical Processing Facility. Check the surrounding text before choosing a meaning.

Abbreviation	Meaning
—	Vacuum Perigee
VPF	Vertical Processing Facility
—	Virtual Reality
WAN	Wide Area Network
WBS	Work Breakdown Structure
WCS	Waste Collection System
ΔV	Delta Velocity, i.e., change in velocity