Questioned Equal To (≟) symbol in LaTeX

The Questioned Equal To symbol is represented by a question symbol above an equal symbol. In this tutorial, you will learn how to write this symbol in LaTeX.

There is no command to get the Questioned Equal To (≟) symbol in LaTeX. So you have to make a \newcommand and use the stackengine package to stack symbols together like this,

\newcommand{\questionequal}{\mathrel{\stackon[1pt]{=}{?}}}

\documentclass{article}
\usepackage{amsmath}
\usepackage{stackengine}
\stackMath

\newcommand{\questionequal}{\mathrel{\stackon[1pt]{=}{?}}}

\begin{document}

 $$ A \questionequal B $$

\end{document}

Output:

But, you can see the above output, here the question symbol is too large. In order to resize the question mark symbol you can use the \scalebox command provided by the graphicx package.

\documentclass{article}
\usepackage{amsmath}
\usepackage{graphicx}
\usepackage{stackengine}

\newcommand{\questionequal}{\mathrel{\stackon[1pt]{=}{\scalebox{0.5}{?}}}}

\begin{document}

 $$ A \questionequal B $$

\end{document}

Output: