NASA Abbreviations and Acronyms

1. SI
   Science Instrument
2. SI
   Center Support Operations (ksc Directorate)
3. SI
   International System of Units (isu Preferred)
4. SI
   Scientific Instrument
5. SI
   Solar Inertial
6. SI C&DH
   Si Control and Data Handling
7. SI/PLSIM
   Si/Payload Simulator
8. SIA
   Shuttle Induced Atmosphere
9. SIC
   Standard Industrial Classification (Code)
10. SIC
    Spacecraft Identification Code
11. SIC
    Support Identification Code
12. SICADS
    Si Control and Data Simulator Systems
13. SID
    Simulator Interface Devices
14. SID
    System Interface Document
15. SID
    Standard Interface Document
16. SIE
    Shuttle Interface Equipment Services
17. SIES
    Shuttle Interface Equipment Services
18. SIES
    Supervision
19. SIF
    Scientific Instrument Formatter
20. SIF
    Sogs Integration Facility

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