The notation for castling, in both the descriptive and the algebraic systems, is 0-0 with the kingside rook and 0-0-0 with the queenside rook; in PGN, O-O and O-O-O are used instead. Castling on the kingside is sometimes called castling short and castling on the queenside is called castling long -- the difference based on whether the rook moves a short distance (two squares) or a long distance (three squares) (Hooper & Whyld 1992).

What's the best answer to this question: can you castle on both sides in chess?
yes