Equivariant maps generalize the concept of invariants, functions whose value is unchanged by a symmetry transformation of their argument, and the value of an equivariant map is often (incorrectly) called an invariant.
Equivariant maps generalize the concept of invariants. Invariants are functions. Functions's value is unchanged by a symmetry transformation of their argument. The value of an equivariant map is often (incorrectly) called an invariant.