Latin Extended-A is a Unicode block. The block has characters of letters with diacritics. This block was named European Latin in the first version.[1]
They are used by languages other than English. The symbols usually show a change in sound, but in some cases (circumflex in French) they signal a (historic) change in spelling. The general purpose of diacritics is disambiguation of sounds. This reflects the fact that the alphabet has many fewer letters than sounds.