DIACRITIC
- mark added to a letter to give it a particular phonetic value
- a mark, point, or sign added or attached to a letter or character to distinguish it from another of similar form, to give it a particular phonetic value, to indicate stress, etc., as a cedilla, tilde, circumflex, or macron.
- distinguishing [adj DIACRITICALLY] / a mark or sign serving to distinguish different values or sounds of the same letter eg an acute accent [n -S]