OO

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