Rook
The rook was a chess piece. 

In 2265, when Gary Mitchell asked if the chess game was finished, Spock responded, "He (James T. Kirk) played most illogically. His next move should have been the rook." ()

When the computer of the  was affected by nanites, it responded to an inquiry with "pawn to  three,  to rook four,  to  three". ()

When Q set a challenge for the bridge crew of the  in 2380 by placing them on a large chess board (with elements of several other games and sports), he made Dr. T'Ana into a rook. ()

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