Etymology
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coign (n.)

also coigne, an archaic spelling of quoin (q.v.) the survival of which is due to Shakespeare's coign of vantage ("Macbeth" I.vi.), popularized by Sir Walter Scott; in this phrase it is properly "a projecting corner" (for observation).

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Definitions of coign

coign (n.)
expandable metal or wooden wedge used by printers to lock up a form within a chase;
Synonyms: quoin / coigne
coign (n.)
the keystone of an arch;
Synonyms: quoin / coigne
From wordnet.princeton.edu