| Acronym | Meaning |
 | OB | Obedience - Obligation - Obligatory - Obsolete - Obstetrics -Ocean Beach (California) - Off Break (cricket) - Old Bryanstonian - Order Of Battle - Outlet Box (electrical) -Overbought (stock Market) -Oversight Board |
| FI | Finnish Language (ISO 639-1 Code) |
| CF | Canadian Forces -Central African Republic (ISO 3166 Digram) - Republic Of The Congo (FIPS 10-4 Country Code) |
| ES | Einsteinium - Exasecond |
| DMOS | Double Diffused MOS Transistor (dee-moss) |
| MOB | Man Over Board - Marching Owl Band - Movable Object Block |
| EOM | End Of Message |
| TY | Tahitian Language (ISO 639-1 Code) |
| CI | Chile (FIPS 10-4 Country Code) - C?te D'Ivoire (ISO 3166 Digram) -Counter-Intelligence |
| CFS | Chronic Fatigue Syndrome |
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