| Acronym | Meaning |
 | NSA | U.S. National Security Agency - Naval Support Activity - No Strings Attached |
| REME | Royal Electrical And Mechanical Engineers |
| PASA | PolyAmide |
| MBCC | Migratory Bird Conservation Commission (U.S.) |
| HEU | Highly Enriched Uranium |
| WAAF | Women's Auxiliary Air Force (WWII UK) |
| FRO | Faroe Islands (ISO 3166 Trigram) |
| RX | Medical Prescription (possibly From Latin Recipere |
| IR | Infrared - Intelligence Requirement (military) -Iran (FIPS 10-4 Country Code; ISO 3166 Digram) - Iran Air (IATA Alpha Code) See Entry For More |
| GNAS | Grand National Archery Society |
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