Equal by definition (≜) symbol in LaTeX

In this tutorial, we will learn how to print qual by definition symbol in LaTeX.

Equal by definition symbol is also known as Triangle Equivalent symbol or delta equal to symbol. In this symbol, a triangle is placed over equal to symbol.

Equal by definition using amssymb package

We can easily do this by using the amssymb package.

\documentclass{article}
\usepackage{amssymb}
\begin{document}
$\triangleq$
\end{document}

Output:

Delta equal to symbol using amsmath package

\documentclass{article}
\usepackage{amsmath}
\begin{document}
$\overset{\Delta}{=}$
\end{document}

Output:

If you want to write like this:

Then do this:

\documentclass{article}
\usepackage{amsmath}
\begin{document}
x$\overset{\Delta}{=}$y
\end{document}