Thedangerous bend orcaution symbol☡ (U+2621 ☡CAUTION SIGN) was created by theNicolas Bourbaki group of mathematicians and appears in the margins ofmathematics books written by the group. It resembles aroad sign that indicates a "dangerous bend" in the road ahead, and is used to mark passages tricky on a first reading or with an especially difficult argument.[1]
Certains passages sont destinés à prémunir le lecteur contre des erreurs graves, où il risquerait de tomber; ces passages sont signalés en marge par le signe ☡ (« tournant dangereux »)
Some passages are designed to forewarn the reader against serious errors, where he risks falling; these passages are indicated in the margin with the sign ☡ ("dangerous bend")
Others have used variations of the symbol in their books. The computer scientistDonald Knuth introduced an American-style road sign depiction in hisMetafont andTeX systems, with a pair of adjacent signs indicating doubly dangerous passages.[3][4][5][6]
In theLaTeX typesetting system, Knuth's dangerous bend symbol can be produced byfirst loading the font manfnt (a font with extra symbols used in Knuth's TeX manual) with\usepackage{manfnt} and then typing\dbend
There are several variations given by\lhdbend,\reversedvideodbend,\textdbend,\textlhdbend, and\textreversedvideodbend.
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