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In the context of Venn diagrams, the universe is not everything, but everything you're dealing with right now. Let's deal with the following list of things: moles, swans, rabid skunks, geese, worms, horses, Edmontosorum (a variety of duck-billed dinosaurs), platypusses, and a very fat cat.
The term diagram in its commonly used sense can have a general or specific meaning: visual information device : Like the term illustration, diagram is used as a collective term standing for the whole class of technical genres, including graphs, technical drawings and tables.