# What is this R-like symbol power 2?

I found this in a computer medical research text.

What is the meaning of this R-like letter? S, in this context is an iso-intensity surface.

 Since context is not sufficient, I think it is a good idea to provide the text here:

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Characters is not what you think it is. – Asaf Karagila Jun 27 '11 at 18:34
Asaf's comment is a reference to the fact (can't really blame the OP) that this question was originally tagged "characters". :-) – ShreevatsaR Jun 27 '11 at 18:44

It's hard to tell without a bit more context (and since I don't know what an iso-intensity surface is). But I think it would more commonly be written $\mathbb{R}^2$, which is the set of pairs of real numbers.
So my guess would be that saying $(x,y)\in \Re^2$ just means that $x$ and $y$ are both real numbers.
I had a German professor who used this symbol instead of $\mathbb{R}$... I'm positive it's the same as a real number. – mathmath8128 Jun 28 '11 at 7:01