Nomenclature is a system of naming and categorizing objects in a given category.
Linnaeus popularised one of the best-known examples: he used the binomial nomenclature system to name the biological world of animals and plants.
See also
In astronomy:
In botany:
In zoology:
In chemistry:
The Russian expression nomenklatura (like "nomenclature", the word derives from the Latin nomenclatura — "name-calling") refers to a system of government patronage used in many countries under Communist rule.