|Look up 0-0 in Wiktionary, the free dictionary.|
0-0 or O-O may refer to:
- Emoticon for a person who wears glasses
- An informal instruction to watch the conductor of an orchestra, seen in orchestral parts
- Kingside castling in chess notation
- Nothing from Nothing, songs
- Object Oriented Programming, a style of modern computer programming
- The win-loss record for a team before the first game of the season
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