Venn di·a·gram
noun/ˈven daɪəɡræm/
/ˈven daɪəɡræm/
(mathematics)- a picture showing sets (= groups of things that have a shared quality) as circles that cross over each other, to show which qualities the different sets have in common
enlarge image维恩图，文氏图（用圆表示集合之间的关系） Word Originearly 20th cent.: named after John Venn (1834–1923), English logician.