OO
OO can represent community groups such as the Oakwood Outlaws or a Toastmasters club, technical terms like orbital order, or governmental bodies such as an Office of Origin.
Miscellaneous
Orange Oatmeal
Open Office
Original Oratory
Oonajor One
Ohh Ohh
Object Object
A Outstanding Options
Optix Obsessive
Optimistic Orators Toastmasters Club
Orbital Order
Octopus Overlords
Openoffice Oo