[Tex/LaTex] How to write the code of this character

symbols

I am writing my B.Sc. thesis. But, I have no idea how to write the following character:

I was trying by $\mathcal{O}$ , but this is not the same I want.

The request symbol is into calrsfs package. Here there is a screenshot of the symbol.

\documentclass[a4paper,12pt]{article}
\usepackage{calrsfs}
\begin{document}
$\mathcal{O}_X$
\end{document}

$((a\implies b) \land (c\implies a)) \implies (c \implies b)$

\land and \wedge are synonymous.

It is an X in the mathpzc font:

enter image description here

\documentclass{article}
\DeclareMathAlphabet{\mathpzc}{OT1}{pzc}{m}{it}
\begin{document}

$\mathpzc{X}$

\end{document}