Nominal area choropleth map

https://courseware.e-education.psu.edu/courses/geog482/policies.shtml

A nominal area choropleth map displays aerial data through the use of colors or patterns to define different areas or regions. The variable mapped is nominal and not ranked. An example of this can be seen in the map above. The variable being mapped are minority groups with the highest percentage of state population and each group is assigned a color.