Isomorphism
(Gr. isos, equal + morphe, form) Similarity of structure. In Gestalt psychology, structural similarity between fields in the brain and the content of consciousness.
In logic and mathematics, a relation between two systems such that there exists a one-one correspondence between their elements, and an identity of some relation that holds between any of the elements in one system and the corresponding elements in the other system. — J.K.F.