In addition to the letters of the alphabet, French orthography makes use of diacritic marks, i.e. special signs which can be combined with certain letters of the alphabet to form additional graphic symbols. There are five of these diacritic marks: the cedilla (‘la cédille’), the acute accent (‘l'accent aigu’), the grave accent (‘l'accent grave’), the circumflex accent (‘l'accent circonflexe’), and the diaeresis (‘le tréma’). Letters with diacritic marks do not have a special entry in the dictionary. Diacritic marks are usually omitted with capital letters.