| Acronym | Meaning |
 | TTTEAF | Thomas The Tank Engine And Friends |
| RU | Russia (ISO 3166 Digram) |
| SI | Sinhalese Language (ISO 639-1 Code) |
| IELTS | International English Language Testing System |
| HEO | Highly Elliptical Orbit |
| FSE | Fire Support Element |
| ISCII | Indian Standard Code For Information Interchange |
| PTAN | Precision Terrain Aided Navigation |
| QR | Quake Rally - Qualitative Reasoning - Queensland Rail - Queen's Rangers - Quick Release - Quiet Riot -Qatar Airways (IATA Airline Designator) |
| ANT | Netherland Antilles (ISO 3166 Trigram) |
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