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

  • Ōō, 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
  • [[]], a ligature of the Latin script.
  • Oo 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
  • Oo Zun (1868–1944), Burmese social worker and Buddhist nun
  • Tin Oo (1927&ndash;2024), Burmese politician, activist and military

See also

  • Double O (disambiguation)
  • 00 (disambiguation)
  • 0-0 (disambiguation)
  • O0 (disambiguation)
  • OOO (disambiguation)
  • <math>\infty</math>, 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
  • <math>0^0</math>, mathematical notation for zero to the power of zero