' 1904
alphabet book. It shows
Ulitsa (street) and
uraganʺ (
hurricane). training mine, distinguishable from the live version by the presence of the letter У (short for учебный,
uchebnyy, "for training"). Historically, Cyrillic U evolved as a specifically
East Slavic short form of the digraph used in ancient
Slavic texts to represent . The digraph was itself a direct loan from the
Greek alphabet, where the combination (
omicron-
upsilon) was also used to represent . Later, the o was removed, leaving the modern upsilon-only form. 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 removed from the
Russian alphabet in the
orthography reform of 1917/19.) It is normally romanised as "u", but in
Kazakh, it is romanised as "w". In the
Cyrillic numeral system, the Cyrillic letter U had a value of 400. ==In other languages==