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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.

ZL : New Zealand.

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