☡


☡ 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. (mathematics, computer science) Used to mark an especially difficult passage or proof in a textbook.
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