From: http://eagereyes.org/techniques/pie-charts
A little-known alternative to the round pie chart is the square pie or waffle chart. It consists of a square that is divided into 10x10 cells, making it possible to read values precisely down to a single percent. Depending on how the areas are laid out (as square as possible seems to be the best idea), it is very easy to compare parts to the whole. The example: women and girls in IT and computing-related fields.
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