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OO

Meaning Over and out
Type Acronym
Rank ★ ★ ★  Common
Usage Online Only (chat, messaging, e-mail)
Comments Used when signing off from an email message or online chat session; also OAO and _O&O_.
Updated February 22, 2013
Meaning On order
Type Acronym
Rank ★ ★ ☆  Average
Usage General (not just online)
Comments Refers to a product that has been ordered, but has not arrived yet. May be seen on e-commerce sites or in order status reports.
Updated November 27, 2013
Meaning OpenOffice
Type Abbreviation
Rank ★ ☆ ☆  Uncommon
Usage Online Only (chat, messaging, e-mail)
Comments An open-source productivity suite, similar to Microsoft Office. Technically referred to as "OpenOffice.org."
Updated November 27, 2013
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