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This particular chart was taken from CGP Grey's video The European Union Explained. However, I've seen many similar charts before.

Chart from CGP Grey video

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This chart is actually a Euler diagram, but not a Venn diagram. All Venn diagrams are Euler diagrams, but not all Euler diagrams are Venn diagrams. Wikipedia explains the difference succinctly:

Unlike Venn diagrams, which show all possible relations between different sets, the Euler diagram shows only relevant relationships.

For example, this diagram omits several sections which contain no elements, such as the section corresponding to countries in the Eurozone and the Schengen Area, but not the EU or the EEA. Including such empty sections would make the diagram more complicated and harder to read, so non-Venn diagrams are often used in cases where there are many different sets, but only a limited number of the possible intersections are populated.

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  • For practical purposes like searching and talking to other people, I would suspect that calling it "Venn diagram", while incorrect, might be more fruitful, as the Venn diagrams are a better known concept.
    – J.E
    Jan 14, 2019 at 7:51
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This type of chart is called a Venn diagram used in set theory and logic. It is a variant of Euler diagrams. Normally the subsets (minterms) are circular but this uses squares for holding the information about the "Universe" of information.

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  • Venn diagrams are usually represented using circles, maybe that's why this one feels a bit confusing.
    – AsTeR
    Sep 11, 2016 at 15:29
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    @AsTeR I see square Venn diagrams all the time.
    – joojaa
    Sep 11, 2016 at 16:18

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