What type of tree map organizes data into circles rather than rectangles?

The type of tree map that organizes data into circles rather than rectangles is known as a circular tree map. This visualization technique uses circles to represent data, allowing for a different way to perceive hierarchical data relationships. Each circle can represent a category, with its size corresponding to a specific quantitative measure, such as volume or value. The hierarchical relationships are maintained by nesting smaller circles within larger ones, aligning closely with how data might be structured in a hierarchy.

This method of visualization can often provide a more intuitive understanding of proportions and relationships in the dataset, and many find it visually appealing compared to traditional rectangular representations.