U with double acute (Cyrillic)
U with double acute is a letter of the Cyrillic script, derived from the Cyrillic letter U.
U with double acute is only used in the Chuvash language, where it represents the close front rounded vowel, the pronunciation of the Latin letter U with umlaut in German. It is placed between and 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.