Diaeresis

In linguistics, a diaeresis or dieresis (AE) (from Greek ???????? (diaerein), to divide) is the modification of a syllable by distinctly pronouncing one of its vowels. The diacritic mark composed of two small dots ( ¨ ) placed over a vowel to indicate this modification is also called a diaeresis. (In the case of an "i", it replaces the original dot.)

External link

• Diacritics Project ? All you need to design a font with correct accents