Ksi is a letter of the early Cyrillic alphabet
Early Cyrillic alphabet
The Early Cyrillic alphabet is a writing system developed in the First Bulgarian Empire in the 9th or 10th century to write the Old Church Slavonic liturgical language...

, derived from the Greek
Greek language
Greek is an independent branch of the Indo-European family of languages. Native to the southern Balkans, it has the longest documented history of any Indo-European language, spanning 34 centuries of written records. Its writing system has been the Greek alphabet for the majority of its history;...

 letter Xi (Ξ, ξ). It was mainly used in Greek loanwords, especially words relating to the Church.

Ksi was eliminated from the Russian alphabet
Russian alphabet
The Russian alphabet is a form of the Cyrillic script, developed in the First Bulgarian Empire during the 10th century AD at the Preslav Literary School...

 along with psi
Psi (Cyrillic)
Psi is a letter in the early Cyrillic alphabet, derived from the Greek letter psi . It represents the sound /ps/, as in English naps...

, omega
Omega (Cyrillic)
Omega is a letter used in the early Cyrillic alphabet. Its name and form are derived from the Greek letter Omega .Unlike Greek, the Slavic languages had only a single /o/ sound, so Omega was little used compared to the letter On , descended from the Greek letter Omicron...

, and yus
Little Yus and Big Yus , or Jus, are letters of the Cyrillic script, representing two Common Slavonic nasal vowels in the early Cyrillic and Glagolitic alphabets. Each can occur in iotified form , formed as ligatures with the letter Decimal I...

 in the Civil Script of 1708 (Peter the Great
Peter I of Russia
Peter the Great, Peter I or Pyotr Alexeyevich Romanov Dates indicated by the letters "O.S." are Old Style. All other dates in this article are New Style. ruled the Tsardom of Russia and later the Russian Empire from until his death, jointly ruling before 1696 with his half-brother, Ivan V...

's Grazhdanka), and has also been dropped from other secular languages.

It represented "60" if used as a number.

Computing codes

character encoding decimal hex decimal hex
Unicode is a computing industry standard for the consistent encoding, representation and handling of text expressed in most of the world's writing systems...

1134 046E 1135 046F
UTF-8 is a multibyte character encoding for Unicode. Like UTF-16 and UTF-32, UTF-8 can represent every character in the Unicode character set. Unlike them, it is backward-compatible with ASCII and avoids the complications of endianness and byte order marks...

209 174 D1 AE 209 175 D1 AF
Numeric character reference
Numeric character reference
A numeric character reference is a common markup construct used in SGML and other SGML-related markup languages such as HTML and XML. It consists of a short sequence of characters that, in turn, represent a single character from the Universal Character Set of Unicode...

Ѯ Ѯ ѯ ѯ
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