Hard to define! A sort of triple-axis combination of a pie-chart, a bar chart and a tree map. To better get a sense of the chart type, please explore the blog posts section below.
A video uploaded by SAF Business Analytics masquerades as a “sunburst chart”, but it’s still a Radial as far as I’m concerned:
interworks.co.uk posted this article back in 2013:
Bora Beran‘s post is likely the most referred to when aiming to recreate this type of chart:
Roberto Reif shared a wonderfully in-depth post extending this concept into polygons:
Bora’s example is available on Tableau Public, and it explores three variants of a radial chart:
The Interworks example is here:
Adam McCann uploaded this brilliant use case for the chart type: