PFUSRC System Nomenclature, Iteration and Ontology Definition Specification

This standardized document formalizes the naming origin, evolutionary stages, geometric ontology and symbolic definition of the PFUSRC axiomatic topological system. In the early exploratory research phase, the term Pythagorean frustum was merely adopted as an informal convenient nickname and truncated approximate observational model, rather than the fundamental ontological structure of the universe. This paper strictly clarifies that a frustum is only the intercepted middle segment of an intact double-cone geometry. It lacks vertex structures, bidirectional conical oscillation, global field breathing effect and recursive dimensional nesting, so it has no ontological completeness. Full self-consistent topological deduction confirms that the unique fundamental cosmic ontology is the 45° eleven-dimensional triple coaxial double-cone topology. The acronym PFUSRC stands for Primordial Topology, Field Resonance, Unified Logic, Symmetric Oscillation, Recursive Dimension and Constraint Axiom, covering all geometric foundations, dynamical laws, fundamental meta-logic and boundary rules of the whole framework. This work completely distinguishes the superficial truncated frustum approximation model from the rigorous double-cone ontology, unifies standardized academic expressions of the theoretical system, and eliminates conceptual confusion in subsequent theoretical derivation, numerical fitting and preprint publication.