| Acronym | Meaning |
| IMU | International Mathematical Union |
| WLB | Women's Land Brigade (WWII Canada) |
| MATS | U.S. Military Air Transport Service (1948-1966) |
| USNP | United States Newspaper Program |
| LRU | Line-Replaceable Unit |
| AI | Air Interdiction -Anguilla (ISO 3166 Digram) -Amnesty International - Artificial Insemination - Artificial Intelligence |
| POI | Program Of Instruction |
| NG | Nanogram - Ndonga Language (ISO 639-1 Code) |
| VIDS | Visual Information Display System |
| NSA | U.S. National Security Agency - Naval Support Activity - No Strings Attached |