What is a diacritic mark placed over a vowel to indicate its pronunciation in a certain way, typically seen in accented syllables?

The acute accent is the term used for the diacritic mark placed over a vowel to indicate a particular pronunciation, often found in accented syllables. It serves to show that the vowel should be stressed or pronounced differently compared to an unaccented vowel. This is common in many languages, such as French or Spanish, where it alters the sound of the vowel.

The circumflex, while a valid diacritic, typically indicates a change in vowel length or historical pronunciation but does not universally signal accenting in contemporary usage. The tilde is primarily used to indicate nasalization in languages like Portuguese or Spanish, while the dieresis shows that two adjoining vowels are to be pronounced separately. Therefore, the acute accent most specifically aligns with the purpose of indicating vowel pronunciation in accented syllables.