
In some Semitic languages, such as Arabic, nunation (تنوين tanwīn) is the addition of a final nūn sound to a noun or adjective to indicate that it is fully declinable and syntactically unmarked for definiteness. There are three of these vowel diacritics, and the signs indicate, from left to right, the endings -un (nominative case), -in (gen...
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http://en.wikipedia.org/wiki/Nunation

the doubling, in writing, of the final vowel symbol to indicate the addition, in speech, of the indefinite suffix n to certain nouns.
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https://www.infoplease.com/dictionary/nunation
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