Jisho

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Wikipedia definition
1. U (Cyrillic)U is a letter of the Cyrillic script. It commonly represents the close back rounded vowel /u/, somewhat like the pronunciation of ⟨oo⟩ in "boot". The forms of the Cyrillic letter U are similar to the lowercase of the Latin letter Y (Y y; Y y), but, as with most Cyrillic letters, the upper and lowercase forms are similar in shape differing mainly in size and vertical placement.
Read “U (Cyrillic)” on English Wikipedia
Read “У” on Japanese Wikipedia
Read “U (Cyrillic)” on DBpedia

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