Governmental & Military Abbreviations and Acronyms

1. IRB
   Irish Republican Brotherhood
2. IRB
   Internal Revenue Bulletin
3. IRB
   Incident Report Book
4. IRB
   International Republican Brotherhood
5. IRBM
   Intermediate-Range Ballistic Missile
6. IRBS
   Intermediate-Range Booster System
7. IRBS
   Infrared Background Sensor
8. IRBT
   Integrated Rail Bus Transit (India)
9. IRC
   Initial Rate of Climb
10. IRC
    Internet Relay Chat
11. IRC
    International Radiation Commission
12. IRC
    Internal Revenue Code of 1986
13. IRCAS
    Intranet Radio Coverage Analysis System
14. IRCFE
    Infrared Communications Flight Experiment
15. IRCS
    Integrated Resource Control System
16. IRCSO
    Indian River County Sheriff's Office
17. IRD
    Independent Research & Development
18. IRD
    Independent Research and Development
19. IRD
    Initial Requirements Document
20. IRD
    Information Records Division

Last updated: May 24, 2020 — Total entries: 74,797