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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.
Techopedia explains Network Diagram. A network diagram is a unique kind of cluster diagram that represents a cluster or small structure of computers or other networking devices. Preidentified icons or symbols are used to draw network appliances and the style of lines between two nodes describes the type of connection.