JCUKEN - Wikipedia

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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 JIUKEN (ЙІУКЕН) layout was the main layout, but it was replaced by JCUKEN when the Russian alphabet reform of 1917 removed the letters Ѣ, І, Ѵ, and Ѳ. The letter Ъ had decreased in usage significantly after the reform.

The Mongolian keyboard uses a modified version of JCUKEN, called "FCUZHEN" (ФЦУЖЭН), where letters specific to Russian are replaced by letters that see more use in Mongolian.

Brahmic scripts	Bengali Dzongkha (Tibetan) InScript (Indian languages; Hindi, Telugu etc) Khmer Meitei (Manipuri) Sinhala Tamil (99)
East Asian scripts	Chinese Japanese (thumb-shift) Korean (Dubeolsik, Sebeolsik)
Other	Arabic Intellark Jawi Georgian Hebrew Russian (pre-reform) Russian (post-reform) Urdu

For mobile
devices

Kana	2-touch input [ja] Nico Touch [ja]
Physical	E.161 iTap LetterWise Multi-tap T9 XT9 SureType Telephone (9-key) Thumb board
Virtual	5-Tiles FITALY Fleksy Flick input Gboard Graffiti KALQ MessagEase ShapeWriter SwiftKey Swype TouchPal Typewise

Chorded
keyboards

Two handed	Palantype Stenotype Velotype
One handed	BAT CyKey FrogPad Microwriter

Standards

Historical

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See also