It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
The Z-Code was originally developed as a service code by Cable & Wireless Ltd. for usage in the commercial communications business.
NATO military Z-signals are completely different from the old Cable & Wireless codes.
The NATO military Z-signals, ZAA...ZXZ, are defined in ACP 131, but the series ZYA...ZZZ is reserved for the temporary or permanent assignment of meanings on an intra-military basis by any nation, service or command.
In the following table, a non-annotated code denotes the original Cable & Wireless usage, * indicates NATO military usage (ACP-131(E), 1997) and ** indicates Russian military usage.
ZOZ* Relay this message (or message ...) in its
present form without decryption.