JCUKEN

JCUKEN (ЙЦУКЕН, also known as YCUKEN, YTsUKEN and JTSUKEN) is the main Cyrillic keyboard layout 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.

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