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Xi (/zaɪ/ ZY or /(k)saɪ/ (K)SY;[1][2] uppercase Ξ, lowercase ξ; Greek: ξι) is the fourteenth letter of the Greek alphabet, representing the voiceless consonant cluster [ks]. Its name is pronounced [ksi] in Modern Greek. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh &sq=Facebook&lang=en&file=File:Phoenician_samekh.svg){kind=small}
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Xi is distinct from the letter chi, which gave its form to the Latin letter X.
- ^ "xi". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
- ^ "xi". New Oxford American Dictionary, 2nd Edition.