The complexity of the proper noun appears in defining individual objects from the viewpoint of two aspects of the onymic sign. At issue here are both its linguistic construction as well as its orthography understood in the normative-administrative sense. Very important for understanding the essence of the onymic sign is indication of the realization of semantic characteristics in the linguistic sphere. It is noted that the proper noun comprises a two-element sui generis linguistic sign, and at the same time is incorporated as a real element of the language into the specific category of names. Proper names form open sets of lexical elements of a given language, but belong also to specific onymic subsystems governed by their own rules. Numerous onymic characteristics differentiate the construction of personal names formed from appellatives to a significantly greater degree than occurs in the case of other onomastic categories. For onomastic researchers there is fundamental significance to the statement that this phenomenon reveals the double status of the proper noun - linguistic and onomastic.
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