I found $\tilde{R}$ in a mathematical text, and I would like to know how this is pronounced. I tried to search on the internet but was not able to find anything related.
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$\begingroup$That symbol on top is a tilde.
So you can pronounce that "arr tilde" or sometimes "tilde arr", depending on your preference. I've gotten used to "tilde arr" because that's how it's typed in LaTeX, namely \tilde R which when you put dollar signs around it, becomes $\tilde R$ (which, I see, is pretty much what you typed in your post).
$\endgroup$ $\begingroup$The symbol $\tilde{R}$ is also pronounced arr twiddle. We can hear it for instance in these lecture notes by F. P. Schuller in minute 27 where he defines a linear map between vector spaces.
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