Spaceflight Abbreviations and Acronyms

1. OOS
   Orbit-To-Orbit Stage
2. OOS
   Orbit-To-Orbit Shuttle
3. OOS
   on-orbit station
4. OOSDP
   On-Orbit Station Distribution Panel
5. OPF
   Orbiter Processing Facility
6. OPI
   Orbiter Payload Interrogator
7. OPIS
   Orbiter Prime Item Specification
8. OPLF
   Orbiter Processing and Landing Facility
9. OPM
   Outer Planet Mission
10. OPO
    Orbiter Project Office
11. OPPAR
    Orbiter Project Parts Authorization Request
12. OPS
    Orbiter Project Schedules
13. OPSS
    Orbital Propellant Storage Subsystem
14. ORD
    Orbital Requirements Document
15. ORS
    Orbital Refueling System
16. ORT
    Orbit Readiness Test
17. ORU
    Orbital Replacement Unit
18. OS
    on-orbit station
19. OSC
    Orbital Sciences Corporationration
20. OSCAR
    Orbiting Satellite Carrying Amateur Radio

Last updated: May 24, 2020 — Total entries: 1,156