VerkkoÝ ý. Y acute. Ý ( ý) is a letter of the Czech, Icelandic, Faroese, the Slovak, and Turkmen alphabets, as well being used in romanisations of Russian. In Vietnamese it is a y with a high rising tonal diacritic. It was used in Old Norse, Old Castillian, and Old Astur-Leonese. Originally, the letter Ý was formed from the letter Y and acute ...