The sixth letter of the Greek alphabet (Ζ, ζ), transliterated as ‘z’
The sixth star in a constellation
The potential difference existing between the surface of a solid particle immersed in a conducting liquid (e.g. water) and the bulk of the liquid
An analytic function ζ of the complex variable z equal to 1−z + 2−z + 3−z + … when the real part of z is greater than 1. Also written Riemann ζ function.