[Tex/LaTex] A “big tau” used in an Italian university book

Question

Into an Italian university book which translates an English version of Modern Quantum Mechanics J.J. Sakurai, I have finded a strange symbol that never I have seen here into this Community and other books for the use of the LaTeX.

It seem a big tau, for my humble opinion. In fact the theme is an infinitesimal translation or spatial displacement.

Is it possible to reproduce a similar symbol without a conflict with the packages that I'm using?

For example using a typical structure of this kind:

\DeclareFontFamily
\DeclareFontSubstitution
\DeclareFontShape
\renewcommand{\Tau}

Your ideas are very welcome.

Answer 1

At the OP's request, I am turning my comment into an answer.

I had suggested using the \scalerel* macro to scale the existing lowercase \tau to the size of a capital letter. This approach will work across math styles, as shown in the MWE.

\documentclass{article}
\usepackage{scalerel}
%\usepackage{txfonts}
\newcommand\Tau{\scalerel*{\tau}{T}}
\begin{document} 
$\Tau (dx') = \ldots$\par
$\scriptstyle\Tau (dx') = \ldots$
\end{document}