| Acronym | Meaning |
| YA | Yottayear |
| ZR | Zaire (ISO 3166 Digram; Obsolete 1997) |
| DWIM | Do What I Mean |
| ITEMS | Interactive Tactical Environment Management System |
| KI | Kiribati (ISO 3166 Digram) |
| J1 | Joint [Manpower &] Personnel Directorate |
| SUB | Student Union Building |
| CDA | UK Centre For Defence Analysis |
| OOO | Out Of The Office |
| PO | Polonium |