| Acronym | Meaning |
 | ATGW | Anti-Tank Guided Weapon |
| IAD | Ion Assisted Deposition |
| O | Oberst - Observer - Obstacle - Octal - Officer - Official - Oh - Operational - Operator - Oprah (magazine) - Outstanding -Oxygen |
| CHN | China (ISO 3166 Trigram) |
| BOPD | Barrel Of Oil Per Day |
| ACORN | Association Of Community Organizations For Reform Now |
| BN | Battalion |
| UCBSA | United Cricket Board Of South Africa |
| ARSC | Arctic Region Supercomputing Center |
| HK | Hong Kong (ISO 3166 Digram; FIPS 10-4 Territory Code) |
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