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From Wikipedia, the free encyclopedia

Xi uc lc.svg
Greek alphabet
Αα Alpha Νν Nu
Ββ Beta Ξξ Xi
Γγ Gamma Οο Omicron
Δδ Delta Ππ Pi
Εε Epsilon Ρρ Rho
Ζζ Zeta Σσς Sigma
Ηη Eta Ττ Tau
Θθ Theta Υυ Upsilon
Ιι Iota Φφ Phi
Κκ Kappa Χχ Chi
Λλ Lambda Ψψ Psi
Μμ Mu Ωω Omega
Obsolete letters
Digamma uc lc.svg Digamma Qoppa uc lc.svg Qoppa
San uc lc.svg San Sampi uc lc.svg Sampi
Other characters
Stigma uc lc.svg Stigma Sho uc lc.svg Sho
Heta uc lc.svg Heta

Greek diacritics

Xi (uppercase Ξ, lowercase ξ) is the 14th letter of the Greek alphabet. It is pronounced [ksi] in Modern Greek, and generally pronounced /ˈsaɪ/ (UK) or /ˈzaɪ/ (US) in English. In the system of Greek numerals, it has a value of 60. The Xi is not to be confused with the letter Chi, which gave its form to the Latin letter X. In ancient times, the Western Greek alphabet used it to represent /kʰ/, while it was used to represent /ks/ in other alphabets. As the alphabet was standardized, Xi was decided to be used for /ks/ and Chi for /kʰ/. While having no Latin derivative, the Xi was adopted into the early Cyrillic alphabet, as the letter ksi (Ѯ, ѯ).

It should not be confused with ≡ (equivalence sign, Unicode hex 2261).

The lower-case letter ξ is used as a symbol for:

A joined variant of Ξ.

The upper-case letter Ξ is used as symbol for:


Up to date as of January 15, 2010

Definition from Wiktionary, a free dictionary

The Universal Character Set
Greek uc xi.png
Codepoint U+039E
Ν ← Greek and Coptic → Ο
See also , and





  1. (physics) the "cascade particles"

See also



Ξ (uppercase, lowercase ξ)

  1. The upper case letter xi (ξι), the 14th letter of the modern Greek alphabet.



  1. The number sixty in Greek numerals.

  1. The number 60,000 in Greek numerals.

See also

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