What is OOO in chess?

What is OOO in chess? In standard chess notation, kingside castling is notated O-O (or 0-0), while queenside castling is notated O-O-O (or 0-0-0), indicating the number of spaces the rook jumps.

In standard chess notation, kingside castling is notated O-O (or 0-0), while queenside castling is notated O-O-O (or 0-0-0), indicating the number of spaces the rook jumps.
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