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quoin (n.)

1530s, in architecture and masonry, "cornerstone, external solid angle," a variant spelling of coin (n.); in early use also in other senses of that word, including "a wedge, wedge-like piece of stone, wood, etc."

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Definitions of quoin from WordNet

quoin (n.)
expandable metal or wooden wedge used by printers to lock up a form within a chase;
Synonyms: coign / coigne
quoin (n.)
the keystone of an arch;
Synonyms: coign / coigne
quoin (n.)
(architecture) solid exterior angle of a building; especially one formed by a cornerstone;
Synonyms: corner
From wordnet.princeton.edu