Bivariate Choropleth Map

http://www.directionsmag.com/articles/sports-illustrated-from-swimsuits-to-maps-the-making-of-the-si-sports-atlas/123556

Above is an example of a Bivariate Choropleth map,  this map type is utilized by displaying to variables on one map ad combines two different sets of graphic symbols or colors. This is useful being that it can covey two separate data(s) together which can be useful for showing a contrast in amounts or before and after results. This map is showing the difference of per capita results from the winter Olympians to the summer Olympians.