| Acronym | Meaning |
 | HM | Heard Island And McDonald Islands (ISO 3166 Digram; FIPS 10-4 Territory Code) |
| NO | Nobelium |
| EDAC | Error Detection And Correction |
| ITU | Intent-to-Use - International Telecommunication Union (International Telegraph Union 1865-1932) |
| PPO | PolyPhenylene Oxide |
| SHORADEZ | SHORAD Engagement Zone |
| MMI | Man-Machine Interface |
| TMR | Twin Main Rotors (helicopter Type) |
| AFRRI | (U.S.) Armed Forces Radiobiology Research Institute |
| AS | Arsenic |
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