0-0
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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
- Love all, a '0-0' (zero-zero) score in tennis, and less commonly in badminton
- Object Oriented Programming, a style of modern computer programming
- A surrogate for ∞, the infinity symbol