| Acronym | Meaning |
| DORA | Defence Of The Realm Act |
| ADIZ | Air Defence Identification Zone |
| PUS | United States Miscellaneous Pacific Islands (ISO 3166 Trigram; Obsolete 1986) |
| NU | Nicaragua (FIPS 10-4 Country Code) - Niue (ISO 3166 Digram) - Nunavut (postal Symbol) |
| YTS | Youth Training Scheme |
| RDO | Rapid |
| XIX | Nineteen (in Roman Numerals) |
| EMEA | Europe |
| CAI | Computer Assisted Instruction |
| CL | Chile (ISO 3166 Digram) -Co-ordination Line - One Hundred And Fifty (in Roman Numerals) |