| Acronym | Meaning |
 | NIU | Niue (ISO 3166 Trigram) |
| MD | Mendelevium |
| COK | Cook Islands (ISO 3166 Trigram) |
| RPO | Radiation Protection Officer |
| NEO | Near-Earth Object - Non-combatant Evacuation Operations |
| NY | New York (postal Symbol) |
| MAGNETAR | Metaprogrammable AGent NETwork ARchitecture |
| PQ | Province Of Qu?bec (obsolete Postal Code |
| CA | California (postal Symbol) - Canada (FIPS 10-4 Country Code; ISO 3166 Digram) - Catalonia -Civil Affairs - Close Armour - Computer Associates - Counter-Air |
| DOA | Dead On Arrival - Dead Or Alive |
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