| Acronym | Meaning |
 | CAA | Canadian Automobile Association - (NORAD) Center For Aerospace Analysis - (U.S.) Center For Army Analysis - (U.S.) Clean Air Act - (U.S. Army) Concepts Analysis Agency - Civil Aviation Authority - Colonial Athletic Association |
| OSS | Office Of Strategic Services (1942?1945 |
| BRB | Barbados (ISO 3166 Trigram) -Be Right Back (Internet Chat Abbreviation) |
| NICAP | National Investigations Committee On Aerial Phenomena |
| DCC | Digital Command Control (model Railroading) - Direct Client-to-Client (Internet Relay Chat) - Dismounted Close Combat |
| AWD | Many |
| NEI | National Eye Institute - Not Enough Information - Nuclear Energy Institute |
| AI | Air Interdiction -Anguilla (ISO 3166 Digram) -Amnesty International - Artificial Insemination - Artificial Intelligence |
| SV | El Salvador (ISO 3166 Digram) -Sportverein (German For Sport Association |
| SO | Shared Object (Unix) - Sheriff's Office - Significant Other -Somalia (ISO 3166 And FIPS 10-4 Country Code Digram) |
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