tombstone (EN)

noun

noun “tombstone”

1. a marker placed at a grave to show who is buried there
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   The old cemetery was filled with tombstones, each bearing the name and dates of the person buried beneath.
2. refers to the symbol "∎", which is used to indicate the end of a proof in mathematics
   After carefully laying out each step of the theorem, the mathematician concluded the proof with a tombstone, signaling to readers that no further explanation was needed.