Dot Distribution Map

https://www.e-education.psu.edu/natureofgeoinfo/book/export/html/1553

A dot distribution map uses dots to describe a specific quantity or presence of something in an area.  A varying density of dots is conveyed on these maps.  The more dot density in a map means more quantity in that area. This dot distribution map shows the Hispanic population in the United States, each dot equals ~100,000 people.