- OIF
- Operation Iraqi Freedom (Governmental » Military)* Optical Internetworking Forum (Community » Conferences)* Office for Intellectual Freedom (Community » Non-Profit Organizations)* Osteogenesis Imperfecta Foundation (Community » Non-Profit Organizations)* Optional InterFace (Computing » Networking)* Oklahoma Investment Forum (Business » Stock Exchange)* Oklahoma Investment Forum (Community)* Olimpíada Internacional De Física (International » Spanish)
Abbreviations dictionary. 2012.