Invariant Amplitude (fractal) M (font or code)

Question

Good day Tex-Community,

I need to use this this specific fractal M character in my presentation. I've taken a photograph down below. What command/package do I have to use?

Answer 1

Use the eufrak or the yfonts package. For an extensive overview see "What are all the font styles I can use in math mode?"

\documentclass{article}
% https://tex.stackexchange.com/a/58124
\usepackage{yfonts}
\usepackage{eufrak}
\begin{document}
From the \texttt{yfonts} package: 
$\textfrak{M}$,
$\textswab{M}$,
$\textgoth{M}$

From the \texttt{eufrak} package: 
$\mathfrak{M}$
\end{document}

Answer 2

Using Detexify I found this as the closest match to your symbol

\usepackage[utf8]{inputenc}
\usepackage{amssymb}
\begin{document}

\[
\mathfrak{M}
\]

\end{document}

Answer 3

If suggest to use either $\mathcal{M}$ or

\usepackage{mathrsfs}


$\mathscr{M}$

For exactly the same shape you are quoting you will need some special font to be determined.