| Acronym | Meaning |
| DMU | Diesel Multiple Unit - A Method Of Connecting Self-propelled Railway Vehicles Together To Form A Train Under The Control Of One Driver. |
| XX | Twenty (in Roman Numerals) |
| SEAD | Suppression Of Enemy Air Defence |
| PDQ | Pre-Defined Queries (Siebel Packages) - Pretty Damn Quick |
| URI | Uniform Resource Identifier |
| ASD(ISP) | (U.S.) Assistant Secretary Of Defense (International Security Policy) |
| OED | Oxford English Dictionary |
| BAA | British Airport Authority |
| CGIG | Cross-Government Implementation Group |
| CS | Caesium |