I have come across the word diacritics. But this seems to include things like commas and apostrophes.
closed as general reference by z7sg Ѫ, Jasper Loy, Hugo, Mitch, Mr. Shiny and New 安宇 Nov 16 '11 at 14:55
This question is too basic; it can be definitively and permanently answered by a single link to a standard internet reference source designed specifically to find that type of information. If this question can be reworded to fit the rules in the help center, please edit the question.