NASA Abbreviations and Acronyms

1. OPTB
   Opposite
2. OPTB
   Operational Program Time Base
3. OPTB
   Oiposite
4. OPTN
   Option
5. OPUS
   Oss-Podps Unified System
6. OR
   outside radius
7. OR
   Oxygen Relief
8. OR
   Operational Right
9. OR
   Operations Requirement
10. OR
    Operations Review
11. OR
    Operations Room
12. OR
    Outer Roll
13. ORA
    Optical Research Associates
14. ORB
    Order
15. ORB
    Orbit
16. ORB
    1 -g Orbiter One-g (trainer)
17. ORCHIS
    System
18. ORCHIS
    Oak Ridge Computerized Wierarchical Information
19. ORCHIS
    Systpm
20. ORCHIS
    Oak Ridge Computerized Hierarchical Information

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