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System of names or terms in a particular field of arts or sciences

Nomenclature (, ) is a system of names or terms, or the rules for forming these terms in a particular field of arts or sciences. The principles of naming vary from the relatively informal conventions of everyday speech to the internationally agreed principles, rules and recommendations that govern the formation and use of the specialist terminology used in scientific and any other disciplines. Naming "things" is a part of general human communication using words and language: it is an aspect of everyday taxonomy as people distinguish the objects of their experience, together with their similarities and differences, which observers identify, name and classify. The use of names, as the many different kinds of nouns embedded in different languages, connects nomenclature to theoretical linguistics, while the way humans mentally structure the world in relation to word meanings and experience relates to the philosophy of language. Onomastics, the study of proper names and their origins, includes: anthroponymy (concerned with human names, including personal names, surnames and nicknames); toponymy (the study of place names); and etymology (the derivation, history and use of names) as revealed through comparative and descriptive linguistics. The scientific need for simple, stable and internationally accepted systems for naming objects of the natural world has generated many formal nomenclatural systems. Probably the best known of these nomenclatural systems are the five codes of biological nomenclature that govern the Latinized scientific names of organisms.

The word nomenclature is derived from the Latin nomen ('name'), and calare ('to call'). The Latin term nomenclatura refers to a list of names, as does the word nomenclator, which can also indicate a provider or announcer of names.

The study of proper names is known as onomastics, which has a wide ranging scope that encompasses all names, languages, and geographical regions, as well as cultural areas. The distinction between onomastics and nomenclature is not readily clear: onomastics is an unfamiliar discipline to most people, and the use of nomenclature in an academic sense is also not commonly known. Although the two fields integrate, nomenclature concerns itself more with the rules and conventions that are used for the formation of names.

Due to social, political, religious, and cultural motivations, things that are the same may be given different names, while different things may be given the same name; closely related similar things may be considered separate, while on the other hand significantly different things might be considered the same. For example, Hindi and Urdu are both closely related, mutually intelligible Hindustani languages (one being sanskritised and the other arabised). However, they are favored as separate languages by Hindus and Muslims respectively, as seen in the context of Hindu Muslim conflict resulting in the violence of the 1947 Partition of India. In contrast, mutually unintelligible dialects that differ considerably in structure, such as Moroccan Arabic, Yemeni Arabic, and Lebanese Arabic, are considered to be the same language due to the pan Islamism religious identity.

Names provide us with a way of structuring and mapping the world in our minds so, in some way, they mirror or represent the objects of our experience.

Elucidating the connections between language (especially names and nouns), meaning, and the way we perceive the world has provided a rich field of study for philosophers and linguists. Relevant areas of study include: the distinction between proper names and proper nouns; as well as the relationship between names, their referents, meanings (semantics), and the structure of language.

A name is a label for any noun: names can identify a class or category of things; or a single thing, either uniquely or within a given context. Names are given, for example, to humans or any other organisms, places, products—as in brand names—and even to ideas or concepts. It is names as nouns that are the building blocks of nomenclature. The word name is possibly derived from the Proto Indo European language hypothesised word nomn. The distinction between names and nouns, if made at all, is extremely subtle, although clearly noun refers to names as lexical categories and their function within the context of language, rather that as "labels" for objects and properties.

Human personal names, also referred to as prosoponyms, are presented, used and categorised in many ways depending on the language and culture. In most cultures (Indonesia is one exception) it is customary for individuals to be given at least two names. In Western culture, the first name is given at birth or shortly thereafter and is referred to as the given name, the forename, the baptismal name (if given then), or simply the first name. In England prior to the Norman invasion of 1066, small communities of Celts, Anglo Saxons and Scandinavians generally used single names: each person was identified by a single name as either a personal name or nickname. As the population increased, it gradually became necessary to identify people further—giving rise to names like John the butcher, Henry from Sutton, and Roger son of Richard which naturally evolved into John Butcher, Henry Sutton, and Roger Richardson. We now know this additional name variously as the second name, last name, family name, surname or occasionally the byname, and this natural tendency was accelerated by the Norman tradition of using surnames that were fixed and hereditary within individual families. In combination these two names are now known as the personal name or, simply, the name. There are many exceptions to this general rule: Westerners often insert a third or more names between the given and surnames; Chinese and Hungarian names have the family name preceding the given name; females now often retain their maiden names (their family surname) or combine, using a hyphen, their maiden name and the surname of their husband; some East Slavic nations insert the patronym (a name derived from the given name of the father) between the given and the family name; in Iceland the given name is used with the patronym, or matronym (a name derived from the given name of the mother), and surnames are rarely used. Nicknames (sometimes called hypocoristic names) are informal names used mostly between friends.

The distinction between proper names and common names is that proper names denote a unique entity e. g. London Bridge, while common names are used in a more general sense in reference to a class of objects e. g. bridge. Many proper names are obscure in meaning as they lack any apparent meaning in the way that ordinary words mean, probably for the practical reason that when they consist of Collective nouns, they refer to groups, even when they are inflected for the singular e. g. "committee". Concrete nouns like "cabbage" refer to physical bodies that can be observed by at least one of the senses while abstract nouns, like "love" and "hate" refer to abstract objects. In English, many abstract nouns are formed by adding noun forming suffixes (' ness', ' ity', ' tion') to adjectives or verbs e. g. "happiness", "serenity", "concentration." Pronouns like "he", "it", "which", and "those" stand in place of nouns in noun phrases. The capitalization of nouns varies with language and even the particular context: journals often have their own house styles for common names.

Distinctions may be made between particular kinds of names simply by using the suffix onym, from the Greek ónoma (ὄνομα, 'name'). So we have, for example, hydronyms name bodies of water, synonyms are names with the same meaning, and so on. The entire field could be described as chrematonymy—the names of things.

Toponyms are proper names given to various geographical features (geonyms), and also to cosmic features (cosmonyms). This could include names of mountains, rivers, seas, villages, towns, cities, countries, planets, stars etc. Toponymy can be further divided into specialist branches, like: choronymy, the study of proper names of regions and countries; econymy, the study of proper names of villages, towns and citties; hodonymy, the study of proper names of streets and roads; hydronymy, the study of proper names of water bodies; oronymy, the study of proper names of mountains and hills, etc. Toponymy has popular appeal because of its socio cultural and historical interest and significance for cartography. However, work on the etymology of toponyms has found that many place names are descriptive, honorific or commemorative but frequently they have no meaning, or the meaning is obscure or lost. Also, the many categories of names are frequently interrelated. For example, many place names are derived from personal names (Victoria), many names of planets and stars are derived from the names of mythological characters (Venus, Neptune), and many personal names are derived from place names, names of nations and the like (Wood, Bridge).