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A check (or checker, Brit: chequer, checkerboard, chequerboard) is a pattern consisting of crossed horizontal and vertical lines forming squares.
Etymology
The word is derived from the ancient Persian word shah, meaning "king", from the oriental game of chess, played on a squared board, particularly from the expression shah mat, "the king is dead", in modern chess parlance "check-mate". The word entered the French language as echec in the 11th.c., thence into English.