|Cyrillic letter Ksi|
|Derived from:||Greek letter Xi (Ξ ξ)|
|The Cyrillic script|
|Archaic or unused letters|
Ksi (Ѯ, ѯ) 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.
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.
|Unicode name||CYRILLIC CAPITAL LETTER KSI||CYRILLIC SMALL LETTER KSI|
|UTF-8||209 174||D1 AE||209 175||D1 AF|
|Numeric character reference||Ѯ
Ksi is found in the cyrillic script: Ѯєнонъ нѣсть зѣло добро (Ksenonŭ nŭctŭ zŭlo dobro [Meaning Xenon is not very good]).