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AO may stand for:

;Angola :ISO 3166-1 alpha-2 country code ;Aosta Valley (Vallée d'Aoste, Valle d'Aosta): abbreviation for the region and province of Italy ;Oiler : US Navy hull classification symbol (AO) ;Adults Only :Rated contents not suitable for people under 18 by Entertainment Software Rating Board

See also: A0 (A-zero)

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