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A small circle raised after a set, or the word int.
Also known as: Set interior, Interior of a set, Int, Raised circle after a set
A raised small circle after a set names its interior: the largest open set inside it. The circle is easily mistaken for a degree sign or a composition operator, which is why many texts write 'int' instead.
Denotes the interior of a set: the union of all open sets contained in it.
Contexts: Mathematics
Is dual to the closure: the interior of a set is the complement of the closure of its complement.
Contexts: Mathematics
Is written as a raised circle or as int, the latter preferred where the circle would be misread as a degree sign.
Contexts: Mathematics
A small open circle set high to the right of a set name, or the three letters i, n and t in roman type.