| Acronym | Meaning |
 | CNV | Copy-Number Variable (genetics) |
| NAAD | North American Air Defense |
| AO | Angola (FIPS 10-4 Country Code; ISO 3166 Digram) -Approach Officer (submarine) - Area Of Operations |
| RARDE | UK Royal Armament Research And Development Establishment (1962?1991) |
| BEO | Banquet Event Order |
| AY | Antarctica (FIPS 10-4 Territory Code) |
| DOI | Digital Object Identifier - U.S. Department Of The Interior |
| HANS | Head And Neck Support (device Used In Many Race Cars) |
| PA | Panama (ISO 3166 Digram) - Paraguay (FIPS 10-4 Country Code) -Partial Agonist -Pennsylvania (postal Symbol) - Petampere -PolyAmide (Nylon) - Prince Albert Piercing - Public Address (vocal Amplification System) - Public Affairs |
| QDR | Quadrennial Defense Review |
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