U+2621, ☡
CAUTION SIGN

[U+2620]
Miscellaneous Symbols
[U+2622]

Translingual

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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