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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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4  
Have you tried $\stackrel{\wedge}{=}$ ? –  pablos Jun 27 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. –  Burcardo Jun 27 at 11:08

3 Answers 3

up vote 13 down vote accepted

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... –  Burcardo Jun 27 at 11:24

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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thanks! honestly, I am fine with the current font (= –  Burcardo Jun 27 at 11:09
    
@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. –  Leo Liu Jun 27 at 12:58

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