Ksi (Cyrillic)

Ksi (Ѯ, ѯ italics: Ѯ ѯ) is a letter of the Cyrillic script.) is a letter of the early Cyrillic alphabet, derived from the Greek letter Xi (Ξ, ξ). It was mainly used in Greek loanwords, especially words relating to the Church.

This article is about the Cyrillic letter. For other uses, see KSI (disambiguation).
Cyrillic letter Ksi
Phonetic usage:/ks/
Numeric value:60
Derived from:Greek letter Xi (Ξ ξ)
The Cyrillic script
Slavic letters
АА̀А̂А̄ӒБВГ
ҐДЂЃЕЀЕ̄Е̂
ЁЄЖЗЗ́ЅИІ
ЇꙆЍИ̂ӢЙЈК
ЛЉМНЊОО̀О̂
ŌӦПРР̌СС́Т
ЋЌУУ̀У̂ӮЎӰ
ФХЦЧЏШЩꙎ
ЪЪ̀ЫЬѢЭЮЮ̀
ЯЯ̀
Non-Slavic letters
ӐА̊А̃Ӓ̄ӔӘӘ́Ә̃
ӚВ̌ԜГ̑Г̇Г̣Г̌Г̂
Г̆Г̈ҔҒӺҒ̌Ӷ
Д́Д̌Д̈Д̣Д̆ӖЕ̃
Ё̄Є̈ԐԐ̈ҖӜӁЖ̣
ҘӞЗ̌З̣З̆ӠИ̃Ӥ
ҊҚӃҠҞҜК̣Ԛ
ᴫЛ́ӅԮԒЛ̈Ӎᵸ
Н́ӉҢԨӇҤО̆О̃
Ӧ̄ӨӨ̄Ө́Ө̆ӪԤП̈
ҎС̌ҪС̣С̱Т́Т̈Т̌
Т̇Т̣ҬУ̃ӲУ̊Ӱ̄
ҰҮҮ́Х̣Х̱Х̮Х̑Х̌
ҲӼӾҺҺ̈ԦЦ̌Ц̈
ҴҶҶ̣ӴӋҸЧ̇
Ч̣ҼҾШ̈Ш̣ꚜЫ̆Ы̄
ӸꚝҌҨЭ̆Э̄Э̇Ӭ
Ӭ́Ӭ̄Ю̆Ю̈Ю̄Я̆Я̄Я̈
Ӏʼˮ
Archaic or unused letters
А̨Б̀Б̣Б̱В̀Г̀Г̧
Г̄Г̓Г̆Ҕ̀Ҕ̆ԀД̓
Д̀Д̨ԂꚀꙢЕ̇Е̨
Ж̀Ж̑ꙂꙄЏ̆
ꚄꚄ̆ꙀЗ̀З̑ԄԆꚈ
ԪꚂꚔІ̂І̣І̨
Ј̵Ј̃ꙈК̓К̀К̆Ӄ̆
К̑К̇К̈К̄ԞК̂
Л̀ԠꙤԈЛ̑Л̇Ԕ
М̀М̃ꙦН̀Н̄Н̧
Н̃ԊԢН̡ѺꙨꙪꙬ
ꙮꚘꚚП̓П̀
П́ҦП̧П̑ҀԚ̆Р́
Р̀Р̃ԖС̀С̈ԌҪ̓
Т̓Т̀ԎТ̑ꚊТ̧Ꚍ
Ꚍ̆ОУꙊУ̇
У̨ꙋ́Ф̑Ф̓Х́Х̀Х̆Х̇
Х̧Х̾Х̓һ̱ѠꙌѼ
ѾꙠЦ̀Ц́Ц̓ꚎꚎ̆
ꚐЧ́Ч̀Ч̆Ч̑Ч̓
ԬꚒꚆꚆ̆Ҽ̆Ш̀
Ш̆Ш̑Щ̆ꚖꚖ̆Ъ̄Ъ̈
Ъ̈̄ꙐЫ̂Ы̃Ѣ́Ѣ̈Ѣ̆
ꙒЭ̨Э̂ꙔЮ̂Ꙗ
Я̈Я̂Я̨ԘѤѦꙘѪ
ꙚѨꙜѬѮѰѲѴ
ѶꙞ
  • List of Cyrillic letters
  • List of Cyrillic multigraphs

Unlike other eliminated letters such as omega and yus, Ksi was a later borrowing from Greek and does not appear in any form in the Glagothic script, which was used until the Middle Ages.

Ksi was eliminated from the Russian alphabet along with psi, omega, and yus in the Civil Script of 1708 (Peter the Great's Grazhdanka), and has also been dropped from other secular languages. It was briefly restored in 1710 and ultimately removed in 1735. While it was no longer used in typographic fonts, it continued to be used by the church, and since clergy actively participated in civil censuses, Ksi can be found in multiple handwritten civil texts all the way until the early 1800s.

In the Civil Script during Peter the Great's time, ksi was also written similarly to an izhitsa with a tail.

Ksi constituted the number "60" in the Cyrillic numeral system.

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