What does OOO stand for?

Earth Physics Branch, Energy, Mines and Resources Canada - Direction de la Physique du Globe, Energie, Mines et Resources Canada Ottawa, Ontario - Library symbol - National Library of Canada (NLC)

Geophysics Collection, Geological Survey of Canada - Collection de la Geophysique, Commission Geologique du Canada, Ottawa, Ontario - Library symbol - National Library of Canada (NLC)

Grants Pass, OR - Location identifier - FAA (FAAL)

Oath of Office - Telegraphy (PCTE)

Office of the Ombudsman

Oleum Olivae Optimum - Best Olive Oil - Pharmacy (ROG)

Order of Owls (EA)

O Sapientia, O Radix, O Adonai - Three anthems sung in Roman Catholic churches before Christmas (ROG)

Out of Office - Internet lingo (NETL)

Out of Order - Telecommunications (TEL)