The meta category including the concepts in any conceptualization, as opposed to 'structuring-concept', which is the meta category to which the dimensions which structure the concepts in any conceptualization belong (are instance of). In Loom, this includes the concepts (but not the properties).
(Slot-Value-Type Structural-Concept Archetype Incoherent) (Slot-Value-Type Structural-Concept Archetype Incoherent) (<=> (Structural-Concept ?Self) (And (Meta-Level-Category ?Self) (Exists (?A) (And (Archetype ?Self ?A) (Unary-Relation ?A))) (Value-Type ?Self Archetype Incoherent) (Value-Type ?Self Archetype Incoherent)))