NASA Abbreviations and Acronyms

1. OCN
   Optical Carrier
2. OCN
   Order Control Number
3. OCO
   Oms Cutoff
4. OCO
   Open-close-open
5. OCP
   Output Control Pulse
6. OCR
   Operations Control Room
7. OCRM
   Orbiter Crash and Rescue Manuals
8. OCS
   Onboard Checkout System
9. OCS
   Optical Control Subsystem
10. OCT
    Octal
11. OCT
    Office of the Chief Technologist
12. OCT
    Optical Communications Technologies
13. OCXO
    Oven-Controlled Crystal Oscillator
14. OD
    Operations Director
15. OD
    Operations Directive
16. OD
    Ordnance
17. OD
    Orbit Determination
18. OD
    Operational Downlink/downlist
19. OD
    Oxygen Drain
20. OD
    Operational Downlink

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