From Teflpedia

Grave (/grɑ:v/) is a diacritic occasionally used in English, consisting of a downward mark above a letter.[1]

Added to A and E it forms À and È, which are found in English. These are mostly found in loans to English, though È is also found in some English words. With I, O and U it also forms Ì, Ò and Ù, though these are not commonly found in loanwords to English.