| Acronym | Meaning |
 | MCI | Microwave Communications |
| EPL | English Premier League |
| CXR | Christmas Island (ISO 3166 Trigram) |
| RX | Receive |
| PO | Dust Devil (METAR Code) -per Os (Latin |
| ATB | Active Time Battle -British Antarctic Territory (ISO 3166 Trigram; Merged With AQ In 1979) |
| IPCC | Intergovernmental Panel On Climate Change |
| RSPB | (UK) Royal Society For The Protection Of Birds |
| GI | Galvanised Iron - Gastro-Intestinal - General Issue -Gibraltar (ISO 3166 Digram; FIPS 10-4 Territory Code) -Government Issue |
| DEPSECDEF | (U.S.) Deputy Secretary Of Defense |
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