Taxonomy is the practice and science of classification. The word finds its roots in the Greek ', taxis (meaning 'order', 'arrangement') and ', nomos ('law' or 'science'). Taxonomy uses taxonomic units, known as taxa (singular taxon). In addition, the word is also used as a count noun: a taxonomy, or taxonomic scheme, is a particular classification ("the taxonomy of ..."), arranged in a hierarchical structure. Typically this is organized by supertype-subtype relationships, also called generaliza… (More on Taxonomy)