NASA Abbreviations and Acronyms

1. S R
   Search and Rescue
2. S R
   Shift Register
3. S R
   Send and Receive
4. SCHED
   Schedule
5. SCHED
   Scheduled
6. SCI
   Science
7. SCI
   Switch Closure In
8. SCIM
   Standard Cubic Inches Per Minute
9. scn
   Specification Change Notice
10. SMU
    Soft Mockup
11. SMU
    Speaker/microphone Unit
12. STU
    Special Test Unit
13. STU
    Star Tracker Unit
14. A/V
    Audiovisual
15. A/V
    Acceptance & Verification
16. A/V
    Assembly & Verification
17. APU
    Auxiliary Power Unit
18. APU
    Auxiliary Propulsion Unit
19. ASTM
    American Society for Testing Materials
20. C/T
    Communication and Tracking

Last updated: May 6, 2025 — Total entries: 14,020