Furthermore, what is this kind of chart called? How was it laid out? Is it a one off manual kinda deal. Does this even have any advantages over a pie chart? II

Furthermore, what is this kind of chart called? How was it laid out? Is it a one off manual kinda deal. Does this even have any advantages over a pie chart? IIRC people are not good at judging relative area at all, even circles. How much does un-wedging the pie help? At least with a pie chart you can try to compare arc length which may be easier?