This symbol represents the set that contains everything. A universal set is a superset to every set included in the diagram.
A Venn diagram is a visual representation of similarities and differences between two or more concepts. It depicts relationships between two or more sets of data by using circles as an illustration. Each circle represents one particular set of data. Overlapping circles represent the similarities, while detached circles represent the difference between sets or concepts.
With the help of a Venn diagram, you can easily describe any relationship between two or more concepts. Using circles for the representation of data makes it simple to depict similarities between two or more factions. That is why these diagrams are typically used for business presentations, logic studies, and mathematics.