CHAR    NUMBER        ENTITY        DESCRIPTION
∀        ∀        ∀    For all
∂        ∂        ∂        Partial diffrential
∃        ∃        ∃        The exists
∅        ∅        ∅        Empty sets
∇        ∇        ∇        Nabla
∈        ∈        ∈        Element of
∉        ∉        ∉        Not an element of
∋        ∋        ∋        Contains a member
∏        ∏        ∏        N-ary product
∑        ∑        ∑        N-ary summation