| 释义 |
- Science and technology
- Transportation
- Places
- Art and entertainment
- Other uses
- See also
{{distinguish|text=00 (disambiguation) (two zeros) or O0 (disambiguation) (the letter "O" followed by zero)}}{{wiktionary|oo|O O|o O|o o|öö}}OO or oo may refer to: {{TOC right}}Science and technology- ‘Ō‘ō, an extinct bird of the genus Moho
- Object-oriented programming, a computer programming paradigm
- O.O (also O.o or o.O), an emoticon to represent two eyes and a nose or mouth
Transportation- SkyWest Airlines (IATA code: OO)
- Belgium (aircraft registration prefix: OO)
- Old Oak Common TMD', s carriage shed (Network Rail depot code: OO)
Places- Oô, a commune in France
- Oo, Indonesia
Art and entertainment- OO (EP), album by South Korean singer Zion.T
- OO, the production code for the 1967 Doctor Who serial The Ice Warriors
Other uses- Oo (digraph), a digraph in orthography
- Original Oratory, a competitive event in high school forensic competitions
- Oakley, Inc. (NYSE stock ticker symbol: OO), subsidiary of Italian company Luxottica
- OO gauge, a 1:76.2 modelling scale in model railroading
- Official Observer, an appointed amateur radio operator
See also- Double-O, producer and half of hip-hop duo o in the Hallo
- Infinity (∞)
- 00 (disambiguation)
- O0 (disambiguation)
- OOO (disambiguation)
- ᅇ, an obsolete unit of the Hangul alphabet
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