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I want to use unicode character 2259 "estimates" in my document, but cannot find it in the symbols-a4 list or via detexify.

It looks exactly like this: ≙

The closest I get is \triangleq: ≜, but it has a different meaning.

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    Have you tried $\stackrel{\wedge}{=}$ ? Commented Jun 27, 2014 at 3:14
  • Well, that was easy. I just expected that there is already a single existing command to produce the symbol since it's a standardized common expression. Commented Jun 27, 2014 at 11:08
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    Possible duplicate of How to look up a symbol or identify a math symbol or character? Commented Aug 12, 2019 at 16:37
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    @Werner While that question is certainly related, this does not look like a duplicate at all! Commented Aug 12, 2019 at 20:19
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    @Mensch: This answer proves otherwise (that the symbol is in symbols-a4). Detexify would not always be accurate, and I'm not sure how often it is updated. For example, \corresponds may have been added recently (or more recent than what is loaded in Detexify). Commented Aug 12, 2019 at 20:36

4 Answers 4

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Use \overset from amsmath:

\documentclass{article} \usepackage{amsmath} \newcommand{\estimates}{\overset{\scriptscriptstyle\wedge}{=}} \begin{document} $A\estimates B$ \end{document}

It won't work in sub/superscripts, but I don't think you need the symbol there.

enter image description here

A different realization is with

\newcommand{\estimates}{\mathrel{\hat{=}}}

that would produce

enter image description here

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With the package fontspec, you may call each symbol by its unicode. In this case, the command would be $\symbol{"2259}$. You just have to look for fonts, which are giving you this symbol.

Here are 4 examples:

% arara: lualatex \documentclass{article} \usepackage{unicode-math} \usepackage{booktabs} \usepackage{fontspec} \begin{document} \begin{tabular}{ll} \toprule Example & Font\\ \midrule $a\wedgeq b$ & Latin Modern Math\\ \setmathfont{xits-math}$a\wedgeq b$ & XITS Math\\ \setmathfont{asana-math}$a\wedgeq b$ & Asana Math\\ \setmathfont{texgyrepagella-math}$a\wedgeq b$ & TeX Gyre Pagella Math\\ \bottomrule \end{tabular} \end{document}

enter image description here

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  • thanks! unfortunately i am not using 'XeTeX or LuaTeX', but 'unicode-math' and 'font spec' require that... Commented Jun 27, 2014 at 11:24
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You can use STIX fonts if you don't mind.

\documentclass{article} \usepackage{stix} % (Times style) Main fonts of the document will be changed \begin{document} $a \wedgeq b$ \end{document}
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  • @Burcardo: It is possible to use only one symbol from the font package. But that's tricky. You can combine two symbols via \stackrel etc., although that isn't perfect. Commented Jun 27, 2014 at 12:58
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There are several packages listed in symbols-a4 that provide this command as \corresponds.

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  • \usepackage{mathabx} and then a \corresponds b . Commented Aug 12, 2019 at 12:48

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