NASA Abbreviations and Acronyms

1. IHP
   Indicated Horsepower
2. IHSR
   Integrated Hardware/Software Review
3. IHTV
   Interim Hypersonics Test Vehicle
4. IHTV
   Interim Hypersonic Test Vehicle
5. IHX
   Interloop Heat Exchanger
6. II
   Implementing Instruction
7. II
   I
8. IIC
   Infrared Imaging Camera
9. IIL
   Integrated Injection Logic
10. IIOP
    In-Orbit Plane
11. IIS
    Inspection Item Sheet
12. IIS
    Joint Integrated Simulation
13. IISS
    Integrated Information Support System
14. IIT
    I
15. IITCS
    Igloo Internal Thermal Control Section
16. IK
    Inner Keel
17. IL
    Internal Letter
18. ILA
    Instrument Landing Approach
19. ILAS
    Instrument Landing Approach System
20. ILBCNU
    I

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