Yu with diaeresis (Ю̈ ю̈; italics: Ю̈ ю̈) is a letter of the Cyrillic script.
Yu with diaeresis is used in the South Selkup (and formerly in the Karelian) languages. It represents the close front rounded vowel, typically represented as , before a palatalized consonant.
See also Cyrillic characters in Unicode
References