NASA Abbreviations and Acronyms

1. OHGVT
   Orbiter Horizontal Ground Vibration Test
2. OHMM
   Ohmmeter
3. OHT
   Overheat
4. OI
   Operational Instrumentation
5. OIB
   Orbiter Interface Box
6. OIC
   Orbiter (orbital) Integrated Checkout
7. OIG
   Office of Inspector General
8. OIL
   Operations Integration Instruction
9. OIR
   Operations Integrationreview
10. OIS
    Operational Intercommunication System
11. OIS
    Orbiter Instrumentation Systems
12. OISR
    Open Item Status Report
13. OISSP
    Office of Interim Space Station Program
14. OIT
    Orbiter Integrated Test
15. OIV
    Oxidizer Isolation Valve
16. OL
    Overload
17. OL
    Operational Left Dsc Or Mdm
18. OLA
    On-Line Archive
19. OLA
    Operating Level Agreement
20. OLA
    Office of Legislative Affairs

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