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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.

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

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    Asaf's comment is a reference to t$h$e fact (can't really blame the OP) that this question was originally tagged ["characters"](http://math.stackexchange.com/questions/tagged/characters). :-)2011-06-27

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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.

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    I had a German professor who used this symbol instead of $\mathbb{R}$... I'm positive it's the same as a real number.2011-06-28