The tombstone, or halmos, symbol — "∎" (Unicode U+220E) — is used in mathematics to denote the end of a proof. Unicode is an industry standard whose goal is to provide the means by which text of all forms and languages can be encoded for use by computers. ... Wikibooks Wikiversity has more about this subject: School of Mathematics Wikiquote has a collection of quotations related to: Mathematics Look up Mathematics in Wiktionary, the free dictionary Wikimedia Commons has media related to: Mathematics Interactive Mathematics Miscellany and Puzzles — A collection of articles on various math topics, with interactive Java... Q. E. D. is an abbreviation of the Latin phrase quod erat demonstrandum (literally, which was to be demonstrated). This is a translation of the Greek (hóper édei deÄ©xai) which was used by many early mathematicians including Euclid and Archimedes. ...

It is called halmos after its eponym Paul Halmos, who first used it in mathematical context, after seeing it was being used to indicate the end of articles in magazines. An eponym is a person, whether real or fictitious, whose name has (or is thought to have) given rise to the name of a particular place, tribe, discovery, or other item. ... Paul Halmos Paul Richard Halmos (born March 3, 1916) is a Hungarian-born American mathematician who has done research in the fields of logarithm theory, probability theory, statistics, operator theory, ergodic theory, and functional analysis (in particular, Hilbert spaces). ... A collection of magazines A magazine is a periodical publication containing a variety of articles, generally financed by advertising and/or purchase by readers. ...

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