Venn diagram
/ven/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 intersections of the circles维恩图, 文氏图（用长方形中的圆或闭曲线表示数学或逻辑的集, 集的公共元用圆的相交表示）。
词源
early 20th cent.: named after John Venn （1834-1923）, English logician.