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U+220E, ∎
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Mathematical Operators

Translingual

English Wikipedia has an article on:
Wikipedia

Etymology

Introduced into mathematical usage by Paul Halmos, modeled after the end sign (a printer’s ornament or dingbat used to indicate the end of an article or story) found in popular print media.

Symbol

  1. (mathematics) QED.

Usage notes

The symbol itself is called a tombstone or halmos in English.