Irgendwie so:
[![alt text][1]][1]
\documentclass[]{scrartcl}
\usepackage{amsmath, pgfmath, graphicx}
\begin{document}
\newlength\myhei
\settoheight{\myhei}{$\left(\frac{1}{8}\right)$}
\newcommand\Mysign{\vcenter{\hbox{\resizebox{!}{1.4\myhei}{!}}}}
normal: $\left(\frac{1}{8}\right) !$ \\
angepasst: $\left(\frac{1}{8}\right)\!\Mysign$ \\
\end{document}
[1]: https://texwelt.de/wissen/upfiles/55555555_182.png
