| Acronym | Meaning |
 | ACO | Airspace Control Order |
| ECS | Emergency Contact System - Enhanced Chip Set (computing) - EOSDIS Core System - Extended Chip Set (computing) |
| TWN | Republic Of China (Taiwan) (ISO 3166 Trigram) |
| SWORD | Subjective WORkload Dominance |
| CANDU | CANada Deuterium Uranium (nuclear Reactor Design) |
| BN | Brunei (ISO 3166 Digram; FIPS 10-4 Country Code) |
| IN | Indium |
| H/MAD | High/Medium Altitude Air Defence (aytchmad; See Also HIMAD) |
| MATREX | Modeling Architecture For Technology |
| POR | Portuguese Language (ISO 639-2 Code) |
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