Pawn
A pawn was a game piece in the game of chess. Metaphorically speaking, to be considered a pawn in the hands of another was to be used against one's will to achieve a desired outcome, similar to being considered a puppet.

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 Jack Ransom and Shaxs into pawns. ()

Appendices

See also
 Pawn shop

Background information 
In the writers' first draft script of , Doctor Phlox found a pawn in the stomach of Captain Archer's pet beagle, Porthos, the dog having recently eaten the pawn as Archer had been playing chess. The pawn was causing the dog some gastrointestinal distress. However, in the final version of the episode, Porthos suffers from gastrointestinal distress caused, instead, by cheese.

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Recreation