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I couldn't find the notation for the external set of all positive unlimited real numbers. It's like the symbol of infinity with a slash over it I've tried \ninfty in fashion of \nequal but it didn't work you can find this notation in this book Nonstandard Analysis in Practice

marked as duplicate by Sebastiano, Phelype Oleinik, Stefan Pinnow, Mico, Circumscribe Dec 4 '18 at 17:00

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Like this?

\documentclass{article}
\usepackage{stackengine} 

\begin{document}

$\stackMath\stackinset{c}{0pt}{c}{0pt}{/}{\infty}$

\end{document}

enter image description here

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