ickeextremal
Ickeextremal is a term encountered in some mathematical discussions to denote an element that is not extremal with respect to a given structure. Because there is no universally standardized definition, the precise meaning of ickeextremal can vary by context, but it generally serves as the antonym of extremal within the same framework.
In order-theoretic contexts, an element is considered extremal if it is minimal or maximal within a poset
In convex geometry, an extremal (or extreme) point of a convex set is one that cannot be
Because ickeextremal is not a universally standardized term, researchers sometimes prefer phrases like non-extremal or non-extreme
See also extremal, extreme point, convex hull, non-extremal, minimal element, maximal element.