Generally, a quoin is a wedge, used to support or anchor other items. More specifically, quoin may refer to:

• Quoin (architecture), the corner stones that anchor the edge of the building wall

• In printing, quoins are wedges used by printers to hold the hand-set type in place in a printer's chase

• In naval warfare, a quoin was a wedge manipulated at the breech end of a cannon to raise or lower the barrel

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