[Tex/LaTex] Approximately equivalent symbol

Question

I want to write a "approximately equivalent" symbol, which has three strokes like equivalent symbol $$\equiv$$ (≡), but the strokes are like that of approximate symbol $$\approx$$ (≈)

Do you know how to write it in LaTeX?

Answer 1

Here I use stacks to set 3 \sims vertically. The scalerel package allows me to preserve the math style of the invocation, and to define the stacking gap as a combination of .5pt plus 1.5 scaled-to-local-math-style points, given as 1.5\LMpt.

\documentclass{article}
\usepackage{scalerel,stackengine}
\def\apeqA{\SavedStyle\sim}
\def\apeq{\setstackgap{L}{\dimexpr.5pt+1.5\LMpt}\ensurestackMath{%
  \ThisStyle{\mathrel{\Centerstack{{\apeqA} {\apeqA} {\apeqA}}}}}}
\begin{document}
$A \apeq B \equiv C$\par
$\scriptstyle A \apeq B \equiv C$\par
$\scriptscriptstyle A \apeq B \equiv C$\par
\end{document}