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NASA Acronyms, Abbreviations, and Initialisms

There are 12860 acronyms, initialisms, and abbreviations in NASA. If you find notice a missing entry, please add it. We are very grateful for the many submissions we get daily!

Acronym
Definition
$#!*
We Have a Problem
(H)
Hazardous (Task Classification)
(S)
Safe (Task Classification)
0G
Zero Gravity
2GRLV
2nd Generation Return to Launch Vehicle
2IC
Second In Command
2M
Micro Miniature
2MASS
Two Micron All-Sky Survey
2STO
Two Stage To Orbit
3-DOF
Three Degree Of Freedom
3AAL
Three Axis Acoustic Levitator
6-DOF
Six Degree Of Freedom
8A
Minority-owned or other Disadvantaged Business
920RQG
920th Rescue Group
A
Angstrom
A
Analog Signal
A
Ampere
A
Alpha
A
Acceleration
A
Aft
A&A
Advertise and Award
A&E
Architectural and Engineering
A&E
Architects and Engineering
A&I
Assembly and Installation
A&L
Approach and Landing
A&P
Attitude and Pointing
A&PS
Administration and Program Support (MSFC Directorate)
A&R
Automation and Robotics
A&RC
Application and Resource Control
A&TA
Assembly and Test Area
A&V
Assembly and Verification
A/A
Air to Air
A/C
Aircraft
A/C
Associate Contractor
A/C
Air Conditioning
A/D
Analog to Digital
A/E
Architectural and Engineering
A/E
Activity Elements
A/F
Air-to-Fuel Ratio
A/FM
Air/Firing Mechanism
A/G
Air to Ground
A/L
AutoLand
A/L
AirLock
A/L
Approach and Landing
AA
Astronomical Applications
AA
Adverse Action
AA
Antenna Assembly
AAA
Avionics Air Assembly
AAC
Aft Access Closure
AACB
Aeronautics and Astronautics Coordinating Board
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