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What does the degree symbol in "Let $(K_n)$ be a sequence of compact subsets such that $K_n \subset K_{n+1}^{\circ}$ mean?

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    Almost certainly, "interior".2012-05-06
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    The [interior](http://en.wikipedia.org/wiki/Interior_(topology)) of the set.2012-05-06
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    @ArturoMagidin You or David should post this as an answer so that the asker can accept it.2012-05-07

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In this context, it almost certainly means the interior of the set.