Nomenclature generally follows the conventions of human nomenclature. Naming conventions and terminology follow the International Code of Zoological Nomenclature. Systems of classification and nomenclature also vary. Some writers preferring phylogenetic nomenclature use Anthracosauria. Mammaliaformes is a term of phylogenetic nomenclature. Reclassifying reptiles has been among the key aims of phylogenetic nomenclature. Using an alphanumeric nomenclature replaced the vernacular names. It is nevertheless important in understanding the nomenclature conventions of inorganic compounds. There is also an IUPAC nomenclature of inorganic chemistry. Anonymous was recognized as authority by the International Code of Zoological Nomenclature in 1999. The F-84 nomenclature can be somewhat confusing. Organic compounds are named according to the organic nomenclature system. There is considerable variation in cartridge nomenclature. It is names as nouns that are the building blocks of nomenclature. The large number of mutants led to a revision of genetic nomenclature for bacteria.