Taxon identifiers are identifiers assigned to biological taxon by biological and taxonomic databases for purposes of establishing a point of reference for each catalogued taxon. Assigning a taxon with a permanent identifier such as a string of numbers allows for information such as taxonomic classification to be updated without affecting the ability to retrieve or reference the data of the respective taxon. A taxon identifier works in much the same way that a barcode is used to retrieve data about an item of interest. When used on Wikipedia, taxon identifiers can be found near the bottom of Wikipedia pages, linking to records on taxonomic databases. In many cases, each taxon name in a taxonomic database has a unique identifier, although this is not always the case. (For example, the International Plant Names Index regularly has multiple identifiers for a taxon name, often but not always of the form N-1, N-2, etc.)  Taxon identifiers enable researchers to search more easily for pertinent information on the subject of an article, without needing to disambiguate the subject manually.  For example, taxon identifiers are used in species articles so that the information in the article can be easily cross-referenced with the popular Catalogue of Life database.  More generally, taxon identifiers are a method of creating and maintaining index terms for bibliographical material.  The links produced by the  template on Wikipedia go to taxon information pages of online biological or taxonomic databases.  As an example, the Wikipedia taxon bar information for Sequoiadendron giganteum looks like this:  The identifiers listed for Sequoiadendron giganteum will link to entries found in the corresponding online databases:   Wikidata: Wikidata, a collaboratively edited knowledge base hosted by the Wikimedia Foundation. Each Wikidata item associated with a taxon holds data such as the taxon identifiers.  ARKive: ARKive, an archival database of films, photographs and audio recordings of the world's species.  FNA: Flora of North America North of Mexico, a multivolume work describing the native and introduced plants of North America.  FOC: Flora of China, a scientific publication aimed at describing the plants native or introduced to China.  Eol: Encyclopedia of Life, a free, online collaborative encyclopedia intended to document all of the 1.9 million living species known to science  GBIF: Global Biodiversity Information Facility, an international organisation that focuses on making scientific data on biodiversity available via the Internet using web services  GRIN: Germplasm Resources Information Network, an online USDA National Genetic Resources Program database for the holdings of all plant germplasm collected by the National Plant Germplasm System  iNaturalist: iNaturalist, a citizen science project mapping and sharing observations of biodiversity across the globe.  IPNI: International Plant Names Index, a database of the names and associated basic bibliographical details of seed plants, ferns and lycophytes  ITIS: Integrated Taxonomic Information System, an American partnership of federal agencies designed to provide consistent and reliable information on the taxonomy of biological species  IUCN: International Union for Conservation of Nature Red List, the world's most comprehensive inventory of the global conservation status of biological species  NCBI: Taxon Browser from the National Center for Biotechnology Information  Plant List: The Plant List, a list of botanical names of species of plants created by the Royal Botanic Gardens, Kew and the Missouri Botanical Garden  PLANTS: Natural Resources Conservation Service, a database from the United States Department of Agriculture (USDA) that provides technical assistance to farmers and other private landowners and managers  Tropicos: Tropicos, an online botanical database containing taxonomic information on plants, mainly from the Neotropical realm (Central and South America)  WCSP: World Checklist of Selected Plant Families , an international collaboration that provides the latest peer reviewed and published opinions on the accepted scientific names and synonyms of selected plant families.  This is a small subset of available databases, and these links will vary from taxon to taxon depending on its type and the availability of database entries.   Supported databases  A complete list of supported databases can be found at Template:Taxonbar/doc#Taxon identifiers   Further information    List of biodiversity databases  Taxonomic database  Biodiversity informatics  Template:Taxonbar  Wikidata:WikiProject Taxonomy  Help:Authority control  বিষয়শ্রেণী:Reader help