| Acronym | Meaning |
| UT | Universal Time |
| YM | Yottametre |
| CSRC | Conflict Studies Research Centre |
| TSO | The Stationery Office (was HMSO Until 1996) - (U.S.) TRICARE Support Office |
| UUV | Unmanned Underwater Vehicle |
| GNB | Guinea-Bissau (ISO 3166 Trigram) |
| RC | See Entry |
| JUO | Joint Urban Operations |
| HRT | Hormone Replacement Therapy |
| NF | Norfolk Island (ISO 3166 Digram) |