[Tex/LaTex] Strange symbol seen in an article

fontssymbols

I am reading H. Sati and U. Schreiber's article "Proper Orbifold Cohomology" — see https://arxiv.org/pdf/2008.01101. On page 2, there is a formula almost at the bottom of the page, with a leaning U after the integral (Borel space). Does anyone know what font this leaning symbol is written with? Or how to produce one in LaTeX?

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Cheers from Mikael in Sweden!

Best Answer

The source is actually available: Select Other formats in the box on the right and download the source as a zip file.

Inspecting the code, it turns out that the author typeset the symbol using this macro:

\def\smooth{\rotatebox[origin=c]{70}{$\subset$}}
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