| Acronym | Meaning |
 | HR | Croatia (FIPS 10-4 Country Code; ISO 3166 Digram) -Harvard Revised Star Catalogue - Human Resources |
| OC | Observer/Controller |
| SMG | Sequential Motorsport Gearbox - SubMachine Gun |
| RI | Rhode Island (postal Symbol) |
| ABS | Acrylonitrile Butadiene Styrene - Anti-lock Braking System |
| AU | African Union (was OAU Before 2000) - American University -Astronomical Unit - Australia (ISO 3166 Digram) - Austria (FIPS 10-4 Country Code) |
| RCAF | Royal Canadian Air Force |
| GLBA | Gramm-Leach-Bliley Act |
| ARP | Address Resolution Protocol - Applied Research Programme |
| OPTAR | Operational Target |
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