Linnaean system (noun, pl. Linnaean systems) – the Linnaean System is a system of biological nomenclature that follows several general principles: (1) all codes of botanical, zoological, bacterial and virological nomenclature are independent; (2) names of taxa are based upon types; (2) the validity of names is determined by priority; (3) only one single name can be the valid name of a taxon; (4) scientific names are treated as Latin regardless of their origin. All codes currently use a binominal form and follow a strictly hierarchical ranking system. The only system of biological nomenclature proposed as an alternative to the ranking hierarchy of the Linnaean System is the Phylocode. The Phylocode currently does not provide principles for naming species and has so far only been proposed as a draft.