| Acronym | Meaning |
| ECL | Emitter Coupled Logic (electronics) |
| RU | Ruthenium |
| SSA | Cargo Submarine (US Navy Hull Classification) |
| MEG | MagnetoEncephaloGraphy |
| PPQ | Pulses Per Quarter (used In Music Programming |
| FYDP | Five-Year Defense Plan (U.S.) |
| BNF | Backus-Naur Form (computing) |
| ACHT | Average Call Hold Time |
| TSO | The Stationery Office (was HMSO Until 1996) - (U.S.) TRICARE Support Office |
| SEM | Sensor Employment Manager |