Diacritic - Wikipedia
https://en.wikipedia.org/wiki/Diacritic
A diacritic (also diacritical mark, diacritical point, diacritical sign, or accent) is a glyph added to a letter or to a basic glyph. The term derives from the Ancient Greek διακριτικός (diakritikós, "distinguishing"), from διακρίνω (diakrī́nō, "to distinguish").The word diacritic is a noun, though it is sometimes used in an attributive sense, whereas diacritical is only ...
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