[Tex/LaTex] How to write ≙ in latex

Question

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.

Answer 1

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.

A different realization is with

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

that would produce