Nomenclature is a system of naming and categorizing objects in a given category.
Linnaeus popularized one of the best-known examples: he used binary names (e.g. in two parts, a process known as binomial nomenclature) to name species of minerals, vegetables, and animals. The names he coined for the last two categories were the start of present day botanical and zoological nomenclature, codified in the ICBN and ICZN. Other codes are also derived from these.
The combination of a genus name and a species descriptor serves to uniquely label each species of organism. For example, humankind is uniquely named by the name Homo sapiens. No other species of animal can have this name. In this way, every species is given a specific identifier that is accepted worldwide, transcending common names that are often neither unique nor consistent from place to place and language to language.
See also
In astronomy:
In biology:
In chemistry:
In Commerce: