JCUKEN

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JCUKEN (ЙЦУКЕН, also known as YCUKEN, YTsUKEN and JTSUKEN) is the main Cyrillic keyboard layout^[1] for the Russian language in computers and typewriters.

Earlier in Russia, the JIUKEN (ЙІУКЕН) layout was the main layout, but it was replaced by JCUKEN in 1953^[2].

Alternative layouts include the Russian phonetic keyboard layouts, in which Cyrillic letters correspond to similar-sounding Latin letters in QWERTY and other layouts.