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Not to be confused with O0 (disambiguation) (Letter "O" followed zero).
|Look up oo, O.O, or öö in Wiktionary, the free dictionary.|
OO or oo may refer to:
- Oakley, Inc., NYSE stock ticker symbol OO
- Object-oriented programming, a computer programming paradigm
- Official Observer, an appointed amateur radio operator
- Oô, a commune in France
- ‘Ō‘ō, an extinct bird of the genus Moho
- Oo (digraph), a digraph in orthography
- OO gauge, a 1:76.2 modelling scale in model railroading
- O.o or o.O, emoticon used in online chat (appears as two eyes) to describe confused or scared
- OO, the ICAO aircraft registration prefix for Belgium
- OO, the Network Rail depot code for the carriage shed at Old Oak Common TMD
- Original Oratory, a competitive event in high school forensic competitions
- SkyWest Airlines, IATA code OO
- 00 (disambiguation)
- ∞, a symbol used to indicate infinity
- ᅇ, an obsolete unit of the Hangul alphabet
- Double-O, a producer and half of hip-hop duo Kidz in the Hall
- O0 (disambiguation)
- OOO (disambiguation)
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