I would like to put a Bourbaki dangerous bend symbol in my text. The LaTeX package manfnt allows to easily type the Knuth variant of the Bourbaki dangerous bend symbol. This variant is basically the Z-shaped dangerous band inside a signal diamond attached to a pole (\dbend). This variant is nice but height: it introduces extra interline (because of the pole). I am looking for a Z-shaped only version, a one that is ready to use.

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    this is unicode U+2621 so it should be in the stix/xits fonts. – barbara beeton Aug 21 '15 at 14:43
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    @barbarabeeton Is that an uppercase U I see before me? – user10274 Aug 21 '15 at 14:46
  • @MarcvanDongen -- uh, yes. (there are some exceptions.) – barbara beeton Aug 21 '15 at 14:53
  • @barbarabeeton Very interesting: any hint on how to type it in LaTeX ? – Spherical Triangle Aug 21 '15 at 15:04
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    for the stix fonts, the command \danger was proposed, but i'm not sure it's the final choice. – barbara beeton Aug 21 '15 at 15:34

A TikZ version with the height of a "Z". Width, height, rotation angle, line thickness, ... can easily be changed.


  line cap=but,
  line join=round,
  very thick,
  rounded corners=1.5pt,
]\draw (1, 0) -- (0, 0) -- (1, 1) -- (0, 1);


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This implements Barbara Beeton's suggestion without loading the stix package:


\DeclareFontShape{U}{stixbbit}{m}{it}{<-> stix-mathbbit}{}


This is the \stixdanger{} symbol.


enter image description here

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  • I like the slightly rotated version, partly because it's more clear that it's not a letter Z or a numeral 2. To get the rotation, it worked for me to use \rotatebox[origin=c]{-10}{\stixdanger}, with rotatebox being provided by the graphicx package. – Ben Crowell Nov 22 '18 at 20:09

Find its unicode, see the fonts which support it, search your system for available fonts and do (Lua- or XeLaTeX needed):

% arara: pdflatex


% or very dangerous...

enter image description here

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Following @barbarabeeton comment, a stix version writes:


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  • Unfortunately the package stix interferes very badly with my target journal template (article document + AmS packages): does a more selective package exist ? ((Note: I am ready to hack for own stuff, but I am not sure about the Journal editorial team behaviour: past experiences convince me to stick to classical stuff)) – Spherical Triangle Aug 21 '15 at 18:24
  • It seems like egreg's answer would be a variation on this that would avoid the clash with the stix package. – Ben Crowell Nov 22 '18 at 19:56

Inspired in Egreg's answer below I present my own Bourbaki's dangerous bendsymbol:

<-> stix-mathbbit

The original symbol would be the \bend symbol defined. I want it thicker too, that's why I define also the \bendsymbol symbol. It is true that it isn't the most elegant way to get it. However, it has (what I think is) and advantage with respect to Egreg's bend symbol, and is that it's defined as a math ordinary symbol, just like \alpha.

It is possible to rotate it if one wants, but I like it just like that.

enter image description here

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