The meaning of the Acronym OO is...

OO is

• Official Observer

More Meanings For OO:

• Objektorientierung
• Object Oriented
• Ochrana Ovzdusi
• Over and Out
• Orbitally Ordered
• Object Oriented
• Other Orthogonal
• Orange Oatmeal
• Ohh Ohh
• Octopus Overlords
• Optimistic Orators Toastmasters Club
• Open Office
• Original Oratory
• Oonajor One
• Object Object

OO is also in:

• Chat
• Chemistry
• Electronics
• Food
• Funnies
• General
• Mathematics
• Science Fiction
• Toastmasters
• Unfiled