Coign

Coign is an older spelling of Quoin, and may refer to:


 * Coign (architecture), masonry blocks at the corner of a wall
 * Coign (gunnery), a wedge used in aiming a cannon
 * Coign (printing), wooden or metal wedges used for locking printing type into a chase
 * A coign, in Crystallography, is the point at which three facets of a crystal meet
 * A coign, in Geology, is an angular plate around which a continent has formed