A rook (♖ ♜ borrowed from Persian رخ, rokh) is a piece in the strategy board game of chess. Formerly the piece was called the tower, marquess, rector, and comes (Sunnucks 1970). The term castle is considered informal, incorrect, or old-fashioned.[1][2] However, in Persian the word for "castling" is qal'eh raften (from qal'eh, "castle") and not rokh raftan.