OO
OO, O_O or variants may refer to:
Arts and entertainment
- OO (EP), by Zion.T, 2017
- OO, production code for the 1967 Doctor Who serial The Ice Warriors
- "O.O" (song), by Nmixx, 2022
Places
- Oô, France
- Oo, Indonesia
Science and transportation
- ʻŌʻō, an extinct bird of the genus Moho
- SkyWest Airlines, IATA airline code OO
- OO, the aircraft registration prefix for Belgium
- Old Oak Common TMD, England, carriage shed depot code OO
Other uses
- several emoticons
- <oo>, a Latin-script digraph
- ‘O‘o stick, a traditional Hawaiian digging bar
- Original Oratory, a competitive event in high school forensic competitions
- OO gauge, a model railway standard
- Official Observer, an appointed amateur radio operator
See also
- Double O (disambiguation)
- 00 (disambiguation)
- 0-0 (disambiguation)
- O0 (disambiguation)
- OOO (disambiguation)
- , infinity symbol
- ᅇ, an obsolete unit of the Hangul alphabet
- ⚭, marriage symbol
- ⱺ, a phonetic character
- Object-oriented programming, a computer programming paradigm
- Orange Order, a protestant fraternal order in Northern Ireland
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