NASA Abbreviations and Acronyms

1. OPPAR
   Orbiter Project(s) Parts Authorization Request
2. OPPL
   Orbiter Project Parts List
3. OPR
   Operation
4. OPR
   Operate
5. OPR
   Operations Planning Review
6. OPR
   Orbiter/payload Recorder
7. OPR
   Oxygen Pressure Regulator
8. OPRN
   Operation
9. OPRV
   Oxygen Pressure Relief Valve
10. OPS
    Operation
11. OPS
    Operational
12. OPS
    Operations
13. OPS
    Oxygen Purge System
14. OPS
    Operations Sequence
15. OPSB
    Orbiter Processing Support Building
16. OPSR
    Operations Supervisor (gstdn Site)
17. OPSYS
    Operating System
18. OPT
    Optics
19. OPT
    Option
20. OPT
    Operational Pressure Transducer

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