Universal Set: Definition, Symbol & Importance in Set Theory

A universal set is a set that contains all possible elements or objects that are under consideration in a particular context or problem. It is denoted by the symbol 'U'. For example, if we are considering a set of all living organisms on Earth, then the universal set would include all animals, plants, fungi, bacteria, and viruses. The universal set is important in set theory because it helps in defining other sets and making operations between them.