Zeta (UK: / ˈ z iː t ə /, US: / ˈ z eɪ t ə /; uppercase Ζ, lowercase ζ; Ancient Greek: ζῆτα, Demotic Greek: ζήτα, classical [d͡zɛ̌:ta] or zē̂ta; Modern Greek: zíta) is the sixth letter of the Greek alphabet.In the system of Greek numerals, it has a value of 7.It was derived from the Phoenician letter zayin.Letters that arose from zeta include the Roman Z and Cyrillic З
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