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tombstone (EN)
существительное

существительное “tombstone”

ед. tombstone, мн. tombstones
  1. надгробие
    The old cemetery was filled with tombstones, each bearing the name and dates of the person buried beneath.
  2. означает символ "∎", который используется для обозначения конца доказательства в математике.
    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.