The meaning of the Acronym OO is...

OO is

• Over and Out

More Meanings For OO:

• Orbitally Ordered
• Object Oriented
• Other Orthogonal
• Order Online
• Oakley, Incorporated
• Open Optionals
• Objektorientierung
• Object Oriented
• Ochrana Ovzdusi
• Office of Origin
• Ogden Air Logistics Center
• Official Observer
• Over and Out
• Orange Oatmeal
• Ohh Ohh

OO is also in:

• Chat
• Chemistry
• Electronics
• FBI Files
• Food
• Funnies
• General
• Mathematics
• NYSE Symbols
• Sports
• Suppliers
• United Nations