NASA Abbreviations and Acronyms

1. HIS
   Hst Instrument Servicing
2. HIS
   Horizontal Situation Indicator
3. HISAM
   Hardware Initiated Standalone Memory
4. HITAR
   Hst Integration & Test Anomaly Report
5. HITS
   High Rate Multiplexer Input/Output Test System
6. HIU
   Headset Interface Unit
7. HIV
   Helium Isolation Valve
8. HIVOLT
   High Voltage
9. HK
   Housekeeping
10. HKV
    Hit-To-Kill Vehicle
11. HL
    Hardline
12. HL
    Heel Line
13. HL
    Hinge Line
14. HLAL
    High-Level Assembler Language
15. HLC
    Hybrid Load Controller
16. HLCL
    High Level Command Language
17. HLCM
    High-Level Control Module
18. HLD
    High Level Discrete (Command Type)
19. HLDS
    Hydrogen Leak Detection System
20. HLLV
    Heavy-Lift Launch Vehicle

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