This class includes systems that: • Encode rules and identity with intention and structure • Are used to classify, describe, and guide human understanding or systems • Exist within regulated and transmissible social contexts • Exhibit self-referential and meta-conceptual properties ⸻ Examples of Entities in This Category: • [[UHT Trait Definitions Full List]] [[UHT Overview]] • The Periodic Table (as an organizing model) • Metadata schemas (e.g., Dublin Core, ISO standards) • Formal ontologies (e.g., OWL class structures) • System modeling languages (e.g., UML, SysML) • Taxonomic rule sets in biology or law