planchet

noun

1. a flat piece of metal for stamping as a coin; a coin blank.

noun

1. a piece of metal ready to be stamped as a coin, medal, etc; flan

n.“metal disk out of which a coin is made,” 1610s, from French planchette, literally “a small board,” diminutive of Old French planche (12c.), from Latin planca “board, slab, plank” (see plank). The planchette used in automatism and on Ouija boards is a re-borrowing of the French word, 1860.