| Acronym | Meaning |
| RPA | Regional Plan Association |
| SRM | Specified Risk Material |
| SMG | Sequential Motorsport Gearbox - SubMachine Gun |
| COGENT | Cognitive Objects Within A Graphical EnviroNmenT |
| RDECOM | (U.S.) Research |
| GANGY | Green Anorak |
| MLHW | Mean Lower High Water (nautical Charts) |
| BGS | Bristol Grammar School - British Geographical Survey |
| YK | Yottakelvin |
| RIS | Range Instrumentation System |