Digramatic Representation Of Sets

DIAGRAMMATIC REPRESENTATION OF A SET: British mathematician, John Venn, devised a simple way to represent set theoretic operations diagrammatically. These diagrams are named after him as Venn Diagrams.
Universal set is represented by a rectangle and its subsets using a circle within it.
In the following figures, basic set theoretic operations are represented using Venn diagrams.

                          Figure: A is a subset of universal set U.