English abbreviations from o9 to oadr
- O9 (Officer grade: Vice Admiral or Lieutenant General)
- OA (Occupational Analysis)
- OAA (OxAloAcetate)
- OAB (Ordem dos Advogados do Brasil (Brazilian Law Board))
- OAC (Organization for African Community)
- OACES (Online Academic Communication Environment And Support)
- OACW (Ohio Athletic Conference Wrestling)
- OACWC (Ohio Athletic Conference Wrestling Championship)
- OAD (Original Air Date)
- OADM (Optical Add-Drop Multiplexer)
- OADR (Originating Agency Determination Required)