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The character is the R in this picture:

enter image description here

I was thinking mathcal or fraktur, but it doesn't seem to be either of them. I tried the Detexify tool and What The Font, but couldn't find anything suitable.

marked as duplicate by Henri Menke, egreg fonts Dec 10 '16 at 20:57

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3

Not exactly but almost

\documentclass{article}
\usepackage[cal=boondoxo]{mathalfa}
\usepackage{bm}
\begin{document}
$\bm{\mathcal{R}}$
\end{document}

enter image description here

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