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It is, in fact, polarization. The reason it's in a circular pattern, is because you can't always know where the sun is coming from. In a polarized camera lens for example, the pattern is in one direction, and you can rotate the lens to suit the position of the sun for the picture you are taking. In the case of cars, it's circular to be effective from all angles, but in this manner it's not always filtering everything out, but filters a good percentage of it from all angles. Similar effect as tint, except it doesn't darken the windows (the slight tint you see in the windows, is actually tint and has nothing to do with the polarization).
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