Coign is an older spelling of

Quoin Quoins ( or ) are masonry blocks at the corner of a wall. Some are structural, providing strength for a wall made with inferior stone or rubble, while others merely add aesthetic detail to a corner. According to one 19th-century encyclopedia, ...

, 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 Crystallography is the branch of science devoted to the study of molecular and crystalline structure and properties. The word ''crystallography'' is derived from the Ancient Greek word (; "clear ice, rock-crystal"), and (; "to write"). In J ...

, is the point at which three facets of a crystal meet * A coign, in

Geology Geology (). is a branch of natural science concerned with the Earth and other astronomical objects, the rocks of which they are composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth ...

, is an angular plate around which a continent has formed

See also