Istot
Istot is a term with no widely accepted definition in mainstream sources. In practice, it appears in a handful of science fiction and fantasy writings, as well as in indie game and worldbuilding contexts, where it is used as a generic label for a creature’s or object’s essential nature or core identity. The word is often treated as a neologism or a constructed-language loanword rather than a standard philosophical term.
In fiction and game settings, istot is commonly described as an immaterial property that persists under change,
Etymology and sense: istot’s origin in published works is not consistent; it may derive from words meaning