http://en.wikipedia.org/wiki/File:Brosen_windrose.svg
This is an example of windrose above which is used to give a view of how wind speed and direction are distributed in a certain location. History wise these preceded the compass rose because there were no differentiation between "cardinal direction" and the wind that blew from a direction. It uses a polar coordinate system to grid frequencies and the direction with the longest spoke shows the direction of the wind with the highest frequency.
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