Xi (letter)
Fourteenth letter in the Greek alphabet / From Wikipedia, the free encyclopedia
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Not to be confused with "≡", the triple bar character, the Cyrillic letter ksi (Ѯ), or the Arabic letter ع.
Not to be confused with Chi (letter).
Xi (UK: /zaɪ/, US: /ksaɪ/;[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 .
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Xi is distinct from the letter chi, which gave its form to the Latin letter X.