Media Abbreviations and Acronyms
- OAOatmqal Agar
- OAOver Actor
- OADOriginal Air Date
- OAFOnAirForce
- OAGOur Affectionate Guardians
- OAHOmnipotent Author Hammerspace
- OALOpen Audio License
- OAMOutdoor Advertising Magazine
- OANAOrganisation of Asian News Agencies
- OANAOrganization of Asian News Agencies
- OASOn American Soil: How Justice Became a Casualty of World War II
- OATOxford Aviation Training
- OBBOklahoma Business Bulletin
- OBCOsservatorio Balcani E Caucaso
- OBCOprah's Book Club
- OBROyster Boy Review
- OBSOlympic Broadcasting Services
- OCOther Characters
- OCOffice of Communications
- OCOffice of Communication
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