U (У, у) is a letter of the Cyrillic alphabet, representing the vowel after non-palatalized (hard) consonants.

In some languages variations of this letter are used:

• Ў with breve (in Belarusian, Dungan, Siberian Eskimo (Yuit), Uzbek)
• with macron (in Tajik)
• with diaeresis (in Altai (Oyrot), Khakas, Gagauz, Khanty, Mari)
• with double acute (in Chuvash)
• straight (in Mongolian, Kazakh, Tatar, Bashkir languages and others)
• straight with bar (in Kazakh)

History

Historically, this letter evolved as a specifically East Slavic short form of the digraph оу used in ancient Slavic texts to represent . The digraph was itself a direct loan from the Greek alphabet, where the combination ου (omicron-upsilon) was also used to represent .

Consequently, the form of the letter is derived from Greek upsilon, which was parallelly also taken over into the Cyrillic alphabet in another form, as izhitsa (). (The letter izhitsa was expelled from the Russian alphabet in the orthography reform of 1917/19.)

Vowel letters

У (Cirillico) | У | У | У (кириллица) | У (ћириличко) | У | У