A carved stone marker placed at the head of a grave to remember and identify a person who has died.
From 'head' plus 'stone.' The combination refers to the stone's position at the head (upper end) of a burial plot, a tradition dating back centuries.
Headstones are essentially humanity's answer to forgetting—we carve names and dates into stone partly because humans are terrified of being forgotten, and stone lasts longer than memory.
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