| Acronym | Meaning |
 | DUSD | (U.S.) Deputy Under-Secretary Of Defense |
| PIRA | Provisional Irish Republican Army |
| RUS | Russian Language (ISO 639-2 Code) |
| TDRS | Tracking Data And Relay Satellite |
| GA | Gallium - Gigaannum |
| SIYSS | Stockholm International Youth Science Seminar |
| FRSA | Fellow Of The Royal Society Of Art |
| KK | Kazakh Language (ISO 639-1 Code) |
| DCYSC | Discovery Channel Young Scientist Challenge |
| VZW | Vereniging Zonder Winstoogmerk (Dutch Non-profit Organisation) |
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