STO may refer to:

Businesses and organizations

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Government

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Non-governmental organizations

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Science and technology

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Sports

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Arts and entertainment

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  • Soldiers of the One, a group in the TV series Caprica
  • Star Trek Online, a massively multiplayer online role-playing game
  • STO, a posture emoticon used for representing a great admiration or great despair, see Emoticon#Orz
  • Sto, pen name of illustrator Sergio Tofano

Transport

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Other uses

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See also

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