The grave accent ( ` ) (US /ˈɡreɪv/ or UK /ˈɡrɑːv/) is a diacritical mark in many written languages, including Breton, Catalan, Corsican, Dutch, French, Greek (until 1982; see polytonic orthography), Haitian Creole, Italian, Mohawk, Norwegian, Occitan, Portuguese, Ligurian, Scottish Gaelic, Vietnamese, Welsh, Romansh, and Yoruba.