A corner or angle; an obsolete or archaic term for a corner section or quartering in heraldry.
From French 'canton' meaning corner or district, from Italian 'cantone' (corner), ultimately from Latin 'canthus' (corner/edge).
Cantoon is basically 'corner' in old heraldic language—coats of arms used corner divisions (cantons) to show family alliances, making geometry itself tell genealogical stories!
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