| Acronym | Meaning |
| YMCA | Young Men's Christian Association |
| AO | Angola (FIPS 10-4 Country Code; ISO 3166 Digram) -Approach Officer (submarine) - Area Of Operations |
| BIST | Built-In Self-Test |
| FRO | Faroe Islands (ISO 3166 Trigram) |
| CAFAD | Combined Arms For Air Defence |
| KV | Kilovolt |
| NH | Nanohenry |
| FYI | For Your Information |
| BRIMS | Behavior Representation In Modeling And Simulation (conference) |
| AX | land Islands (ISO 3166 Digram) |