See also: [U+25A0 BLACK SQUARE] and [U+23F9 BLACK SQUARE FOR STOP]
U+220E, ∎
(LaTeX: \blacksquare)
END OF PROOF

[U+220D]
Mathematical Operators
[U+220F]

TranslingualEdit

 
English Wikipedia has an article on:
Wikipedia

EtymologyEdit

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.

SymbolEdit

  1. (mathematics) QED.

Usage notesEdit

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