Z

Z
Z code Three letter codes for use in military radio instead of sentences or phrases. An extension (not a replacement) of the existing Q Code, these added codes are not in use by any of the civilian services (amateur radio, aviation, marine) currently using Q code.

Zero Beat : one or both of two signals are adjusted so that they are identical and in phase.

Zulu : (z) Another term for Greenwich Mean Time (GMT). Also known as UTC