Zeta

For other uses, see Zeta (disambiguation).

Zeta (uppercase/lowercase Ζ ζ), is the letter of the Greek alphabet, used to represent the "z" sound in Ancient and Modern Greek. In the system of Greek numerals, it has a value of 7. Letters that came from it include the Roman Z and Cyrillic З.

In mathematics, the lowercase Zeta is used to represent the Riemann Zeta Function.