What is "ooo"

abbr. 1 An abbreviation for hugs, usually placed at the end of a letter or in text messaging; often placed alongside xxx. 2 An abbreviation for '''Out of Office''', a phrase often used in professional contexts to indicate that someone is unavailable for work (usually because they are on vacation).

OOO may refer to:

• .OOO, an Internet top-level domain
• Kamen Rider OOO, a 2010-2011 tokusatsu series
• Limited liability company (Russian: Общество с ограниченной ответственностью, traslit. Obshchestvo s Ogranichennoy Otvetstvennostyu), a legal form of business company in Russia and other countries
• Object-oriented ontology, a metaphysical theory
• OOO gauge, an old British model railway scale
• OpenOffice.org, an office application suite
• Out-of-order execution, a paradigm in microprocessors
• The Land of Ooo, the setting of Adventure Time
• Out of Office, indicating that the individual is on vacation

O-O-O may refer to:

• Long (or queenside) castling, in Portable Game Notation