What is the mark used above vowels in some foreign languages called?

The mark used above vowels in some foreign languages is called a diacritic.

Here's a breakdown:

* Diacritics are small marks added to letters to modify their pronunciation or meaning.

* Accents are a specific type of diacritics that indicate stress or tone in a language.

* Tildes, umlauts, cedillas, and circumflexes are all examples of diacritics.

For example:

* Á in Spanish indicates a stressed "a" sound.

* Ö in German represents a distinct vowel sound.

* Ç in French represents a soft "s" sound.

The specific type of diacritic used varies depending on the language and the desired modification.