Xi (letter)

Not to be confused with "≡", the triple bar character, the Greek Chi (Χ), the Cyrillic letter ksi (Ѯ), or the Arabic letter ع.

Xi (/zaɪ/ ⓘ ZY or /(k)saɪ/ (K)SY; 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 both Ancient Greek and Modern Greek. In the system of Greek numerals, it has a value of 60. Xi was derived from the Phoenician letter samekh (𐤎).

Xi is distinct from the letter chi, which gave its form to the Latin letter X.

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