A coign (also written quoin
, and coin
) is the exterior angle of a wall
, etc. and all component stones
of the angle
. Coign stones tend to be larger than the stones of the wall proper, and lend an aesthetic
to the structure
. A coign is also the term for a keystone
in an arched doorway. The origin of the word is from the French coin
, meaning "corner
In printwork, a coign is a wooden or metal wedge to lock the type in a chase.
In the context of missle weapons, a coign is a wedge used to raise the angle of a gun or other projectile weapon.