Transportation Abbreviations and Acronyms

1. SI
   International System of Units (Système international d'unités)
2. SI&A
   Structure Inventory and Appraisal
3. SIAP
   Standard Instrument Approach Procedure
4. SIAP
   Standard Instrument Flightxprocedure
5. SIC
   Seat In Coach
6. SIC
   Standard Industrial Classification (Code)
7. SID
   Standard Instrument Departure
8. SID
   Single Deck
9. SID
   Speed Indicating Device
10. SID
    Side Impact Dummy
11. SID
    Static Impeller Driven
12. SIDS
    Standard Instrument Departure System
13. SIDS
    Sudden Import Death Syndrome
14. SIECA
    General Treaty of Economic Integration, Central American States
15. SIGMET
    Significant Meteorological Information
16. SIGOP
    Signal Optimization
17. SIGTTO
    Society of International Gas Transport and Terminal Operators
18. SIIP
    Springfield Interchange Improvement Project
19. SIM
    Schedule of Implementation Procedures
20. SIMMOD
    Airport and Airspace Simulation Model

Last updated: January 23, 2022 — Total entries: 10,051