1

Can you help me please, how to type the sign that is emphasized? It looks like mirror image of sign \partial

enter image description here

  • Welcome to the TeX.SE....that symbol not correspond to partial but to the calligraphic O. – Sebastiano Aug 4 at 15:02
2

For example using mathrsfs package give to you the symbol O:

enter image description here

\documentclass[12pt]{article}
\usepackage{mathrsfs}
\begin{document}
$\mathscr{O}$
\end{document}  
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