The 1944 Bletchley Park Cryptographic Dictionary

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ZENIT :

1. A message containing the weather observations made by a German aircraft on a meteorological flight.

2. The cipher used by a German aircraft for transmitting such messages to its base.

ZIP :

A report originating in B.P.

ZODIAC :

The special form of zenit employed when zenit observations are rebroadcast in a German Naval collective.

ZONING :

1. Arrangement in zones or sections.

2. A limitation in a code book consisting in the restriction of particular classes of code-groups to particular classes of plain language units, e.g. the use of groups beginning with a particular figure or letter for words beginning with a particular letter or particular letters.

ZUSATZWALZE :

The fourth wheel (i.e. fourth from the right) of a four-wheel Enigma machine, not interchangeable with the other wheels and not turning over during the encipherment of a message, but capable of being set in any of twenty-six positions and so together with the Umkehrwalze providing in effect a set of twenty-six different Umkehrwalzen.

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