Perhaps you mean the Venn diagram.
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a Venn diagram consists of two overlapping circles, and is generally used as a compare and contrast diagram. a diagram in general is just a way to show information. in short, they are not the same thing, a venn diagram is a type of diagram.
comparison and contrast
graph
Sankey diagram is named after Irish Captain Matthew Henry Phineas Riall Sankey. He first used this type of diagram in 1898.
pie graph