NASA Abbreviations and Acronyms

1. HCSL
   Hybrid Computation and Simulation Laboratory
2. HCU
   Hydraulic Charging Unit
3. HCV
   Helium Check Valve
4. HCV
   Hydrogen Check Valve
5. HD
   Head-Up Display
6. HD
   Hoiddown
7. HD
   Highly Desirable
8. HD
   Horizontal Drain
9. HD
   Hydrogen Drain
10. HDA
    Housekeeping Data Acquisition
11. HDA
    Hubble Data Archive
12. HDBK
    Handbook
13. HDC
    Hasselblad Data Camera
14. HDC
    Hybrid Device Controller
15. HDDR
    High-Density Digital Recorder
16. HDI
    Human Development Institute
17. HDIS
    Hst Digital Imaging System
18. HDOS
    Hughes Danbury Optical Systems
19. HDP
    Holddown Post
20. HDP
    Hold-Down Post

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