U with double acute (Ӳ ӳ; italics: Ӳ ӳ) is a letter of the Cyrillic script,[1] derived from the Cyrillic letter U (У у У у).
U with double acute is used only in the alphabet of the Chuvash language, where it represents the close front rounded vowel /y/, the pronunciation of the Latin letter U with umlaut (Ü ü) in German. It is placed between ⟨У⟩ and ⟨Ф⟩ in the Chuvash alphabet. It is usually romanized as ⟨Ü⟩ but its ISO 9 transliteration is ⟨Ű⟩.
It was also formerly used in the Altai alphabet of 1840.