1. In physics, the symbol for impedance (electricity and magnetism).
2. Zenith distance

The file extension identifying a UNIX file compressed using the gzip or compact utility. See also gzip.

The file extension for UNIX files that have been compressed using the compress utility. See also compress.

Z PARTICLE

26th and last letter in the English and other modern alphabets. Zeta (Z, p) was the sixth letter in the classical Greek alphabet. It is used initially and medially in many words of Greek or Oriental origin, and many writers employ it in preference to s in such words as baptize and organize, where the suffix is derived ultimately from the Greek.