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Tombstone (typography)
The tombstone, halmos, or end of proof mark "" is used in mathematics to denote the end of a proof, in place of the traditional abbreviation "QED" for the Latin phrase "quod erat demonstrandum".
More at Wikipedia
Bourbaki dangerous bend symbol
End-of-file
More related topics
End-of-transmission character
Q.E.D.
Mathematical symbols
Typography
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