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 (also O.o or o.O), an emoticon to represent two eyes and a nose or mouth
  • 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

https://en.wikipedia.org/wiki/OO

"For all our failings, despite our limitations and fallibilities, we humans are capable of greatness."
Carl Sagan
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