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When used as a diacritic mark, the term dot is usually reserved for the Interpunct ( · ), or to the glyphs 'combining dot above' ( ◌̇ ) and 'combining dot below' ( ◌̣ ) which may be combined with some letters of the extended Latin alphabets in use in Central European languages and Vietnamese.
Language scripts or transcription schemes that use the dot above a letter as a diacritical mark:
The overdot is also used in the Devanagari script, where it is called anusvara.
In mathematics and physics, when using Newton's notation the dot denotes the time derivative as in v=\dot{x}. However, today this is more commonly written with a prime or using Leibniz's notation. In addition, the overdot is one way used to indicate an infinitely repeating set of numbers in decimal notation, as in 0.\dot{3}, which is equal to the fraction ^{1}⁄_{3}, and 0.\dot{1}\dot{4}\dot{2}\dot{8}\dot{5}\dot{7}, which is equal to ^{1}⁄_{7}.
The underdot is also used in the Devanagari script, where it is called nukta.
In Unicode, the dot is encoded at:
̇
and at:
̣
There is also:
˙
Spanish language, Ḷ, Latin, Asturias, Indo-European languages
Ó, Ç, Ș, É, Á