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text in math latex. An addition to Martin Scharrers answer. Using letters from math font in text mode.
In LaTeX all mathematics needs to be inside some maths mode contruction and many symbols including circ are defined to only work in maths mode. The symbol is in normal text. This is achieved by the use of two operating modes.
Problems with using numbers and italic greek of Alegreya font in math mode.
It is assumed that any characters represent variable names. TeX - LaTeX Stack Exchange is a question and answer site for users of TeX LaTeX ConTeXt and related typesetting systems. This is achieved by the use of two operating modes. As the other anwsers show the standard way to cope with this is to place circ between dollar signs.