☡

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Archived revision by Metaknowledge (talk | contribs) as of 00:20, 13 January 2019.
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Translingual

English Wikipedia has an article on:
Wikipedia

Etymology

In mathematics, first introduced by Nicolas Bourbaki in their treatise Éléments de mathématique.

Symbol

☡

  1. caution sign
  2. (mathematics, computer science) Used to mark an especially difficult passage or proof in a textbook.
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