Venn diagram
https://gyazo.com/25d0a7780424d58b4893ddd79a1f6874
source: By User:Verycurve - Just took the code in the English Wikipedia and submitted it, CC BY-SA 3.0
noun
a diagram representing mathematical or logical sets pictorially as circles or closed curves within an enclosing rectangle (the universal set), common elements of the sets being represented by the areas of overlap among the circles.
〘数〙 ベン図〘集合の相互関係を示す複数の円を用いた図〙
ORIGIN
early 20th century: named after John Venn (1834–1923), English logician.