Question

What is the symbol for an empty set?

Answer 1

Empty set:

• The set that has no elements in it is called an empty set.
• It is also called a null set.
• The cardinality of the empty set is $0$.
• The empty set is denoted by: $\left\{\right\}$ or $\varphi$

Hence, the symbol of empty set is $\left\{\right\}$or $\varphi$