How do you pronounce $\tilde{R}$?

Question

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.

Answer 1

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).

Answer 2

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.