| Acronym | Meaning |
 | PBN | PolyButylene Naphthalate |
| WVR | Women's Volunteer Reserve (WWII UK) |
| ATN | Dronning Maud Land (ISO 3166 Trigram; Merged With AQ In 1983) |
| CRI | Costa Rica (ISO 3166 Trigram) |
| A2C2 OR A?C? | Army Airspace Command And Control |
| EG | Egypt (ISO 3166 Digram; FIPS 10-4 Country Code) |
| CHAMPUS | (U.S.) Civilian Health And Medical Program Of The Uniformed Services |
| LARP | Live-Action Role-Playing |
| ECM | Electronic Counter-Measures - Enterprise Content Management |
| NACC | North Atlantic Cooperation Council |
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