Symbols are the entities that are not present in our keyboard like Euro(€), Empty set(∅) etc. we can add it manually by the use of various numbers as given below: Numbers Symbols ∀ ∀ ∂ ∂ ∃ ∃ ∅ ∅ ∇ ∇ ∈ ∈ ∉ ∉ ∋ ∋ ∏ ∏