ABSTRACT
As a term, "isology" has been increasingly employed in literary and artistic criticism. However, this term carries different meanings in different academic fields. The explication and applications of "isology," diverse as they might seem, mostly derive from the idea of "heterogeneous isomorphism" in Gestalt psychology, which emphasizes the concept of "similar structure" or "joint construction." The most typical manifestation of the phenomenon of "isology" in linguistic signs is the expression of "idioms." Existing scholarship tends to define the mechanism of marrying a sign's signifier and the signified as "arbitrary" or "random." However, the existence of "isology" has subverted this arbitrariness or randomness, manifesting an irresistible compulsoriness. This compulsoriness stems from the purposiveness pre-configured by the sign communicator and is a symbolized expression of the ideology of a given social class. The existence of isology is inextricably connected with the ideology of a given society.
