The word quiddity was used in scholastic philosophy as a technical term for the essence of something. It derives from the Latin word quid, meaning “what,” and means the “whatness” of something, or “what it is.”
Taking this as a lead, I will coin the word quaddity, meaning “fourfoldedness” or that something embodies a fourfold quality. A four-leafed clover, for example, since it embodies the fourfold quality of having four leaves, is an expression of quaddity.
Tetralogians now have a new technical term at their disposal.
Claritas is Quadditas.