symbols – Changing Unicode Font for a Single Symbol in LaTeX

symbolsunicode

I am trying to get the "Bourbaki" symbol (dangerous bend U+2621).
I use latin modern font which doesn't have this symbol, so I tried this (changing the font in STIX):

\documentclass[10pt,a4paper,french]{article}

\usepackage{babel}
\usepackage[warnings-off={mathtools-colon,mathtools-overbracket},math-style=french]{unicode-math}

    \usepackage[scale={0.75,0.8},footskip=1.5cm,heightrounded]{geometry}
    
    \NewDocumentCommand{\bourbaki}{}{{\setmainfont{STIX two Text}\symbol{"2621}}}
    
    
    \begin{document}
        \bourbaki
    \end{document}

It doesn't work because in the log file, I get:
Missing character: There is no ☡ (U+2621) in font STIXtwoText:mode=node;script
=latn;language=dflt;+tlig;!

How could I get the symbol?

Best Answer

As far as I can tell, STIX Two Text doesn't have the glyph, but STIX Two Math has it.

Since there is no law that requires math fonts to be exclusively used for math, you just define a suitable font face.

\documentclass[10pt,a4paper,french]{article}
\usepackage{babel}
\usepackage[scale={0.75,0.8},footskip=1.5cm,heightrounded]{geometry}

\usepackage[
  warnings-off={mathtools-colon,mathtools-overbracket},
  math-style=french
]{unicode-math}

\newfontface{\STIXTWO}{STIX Two Math}

\NewDocumentCommand{\bourbaki}{}{\mbox{\STIXTWO\symbol{"2621}}}

\begin{document}

\bourbaki

\end{document}

Related Solutions

[Tex/LaTex] Define spec symbol glyph’s Unicode

You guessed right that the "2201 is a number in hexadecimal representation, but this number is not connected to Unicode (which was born years after Knuth invented mathcodes).

The four hexadecimal digits tell TeX that \cdot is an operation symbol (the first digit 2), which must be taken from the font in math family 2 (the second digit), choosing the glyph at slot "01.

TeX knows about at most 16 math families, each can define three fonts for the normal size, first level subscripts and superscripts, and second level sub(super)scripts.

Family 0 fonts contain the upright letters, family 1 the math italic ones; family 2 fonts contain the most common math symbols; finally family 3 fonts contain the "big" symbols such as extensible parentheses.

These four families are compulsory if one wants to typeset math formulas, as TeX relies on parameters from these fonts to do its job. Other families can be (and are) defined by the LaTeX kernel (for \mathbf, \mathsf and so on) or by additional packages (for example stmaryrd).

There's no connection whatsoever between math codes and Unicode.

The XeTeX and LuaTeX engines define new primitives for dealing with Unicode math fonts, but that's another story.

TeX fonts contain at most 256 glyphs, the standard math fonts only 128. Their tables are laid out in the TeXbook or in TeX by Topic (on TeX Live this one is available with texdoc texbytopic). You can produce yourself the font tables by typesetting the following document:

\documentclass{article}
\usepackage[a4paper,margin=3cm]{geometry}
\usepackage{fonttable}
\setcounter{secnumdepth}{0}
\pagestyle{empty}
\begin{document}

\section{Family 0}
\xfonttable{OT1}{cmr}{m}{n}
\newpage

\section{Family 1}
\xfonttable{OML}{cmr}{m}{n}
\newpage

\section{Family 2}
\xfonttable{OMS}{cmr}{m}{n}
\newpage

\section{Family 3}
\xfonttable{OMX}{cmex}{m}{n}

\end{document}

symbols – How to Insert Unicode Symbol

You should separate input and output. If you want to print a symbol you at first need a font which contains it. If you want to use normal latex (it will work with xelatex too) you can e.g. use the dingbat font to get an anchor. If you want to use the symbol in the input you must declare it (I'm not sure if the ⚓ copy& paste correctly):

\documentclass[12pt]{article}
\usepackage[utf8]{inputenc}
\DeclareUnicodeCharacter{2693}{\anchor}
\usepackage{dingbat}
\begin{document}
\anchor ⚓ 
\end{document}

With xetex you can use e.g. dejavu sans (if you get the wrong glyph:make sure that you have only version of dejavu sans). Here too you can use commands/other notation if you don't want to use the symbol in the input:

\documentclass[12pt]{article}
\usepackage{fontspec}
\begin{document}
{\fontspec{DejaVu Sans Condensed} ^^^^2693 \char"2693 ⚓}
\end{document}

Best Answer

Related Solutions

[Tex/LaTex] Define spec symbol glyph’s Unicode

symbols – How to Insert Unicode Symbol

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