A diamond-shaped board displaying a coat of arms, typically hung on the outside of a house after someone's death as a memorial.
From hatchment (probably from 'achievement' in heraldic terminology), a term used in heraldry and funeral customs dating back to the medieval period.
These are like medieval 'death announcements'—when someone important died, their heraldic hatchment would be displayed outside their home for weeks, serving as public notice to the entire community!
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