| Acronym | Meaning |
 | UO | Urban Operations |
| IT | InferoTemporal (neurophysiology) - Information Technology -Italy (FIPS 10-4 Country Code; ISO 3166 Digram) |
| 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 |
| UNDP | United Nations Development Programme |
| WSTC | Women Signallers Territorial Corps (WWII UK) |
| CSSCS | Combat Service Support Control System |
| CUP | Cuban Peso (ISO 4217 Currency Code) |
| EASA | European Aviation Safety Agency |
| PCP | Phencyclidine - Pneumocystis Jiroveci Pneumonia (formerly Peumocystis Carinii) -Probabilistically Checkable Proof |
| AFL | CIO -American Federation Of Labor - Congress Of Industrial Organizations |
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