The 1944 Bletchley Park Cryptographic Dictionary

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SIGNAL :

(especially). A code or cipher message, usually one sent by wireless.

SIGNAL INTELLIGENCE :

The organization responsible for the interception of all enemy and neutral communications and radio transmissions (cf. Y Service, which is one part of this), their deciphering and decoding and the preparation of the Intelligence resulting therefrom in a useful form.

SIGNATURE :

Name of originator, usually occurring at end of cipher message; code- group for name of originator.

SIGNIFICANCE :

(especially). Quality whereby any feature of code or cipher message differs from what may be reasonably attributed to accident.

SIGNIFICANT :

1. Having meaning or significance.

2. Exhibiting some feature or limitation which cannot reasonably be attributed to chance.

SIGN-OFF :

A signal (usually VA) denoting the termination of a morse transmission.

SIMPLE TRANSPOSITION :

Transposition in which only one rearranging process is involved.

SINGLE CHI (pron. tshi) :

Simple transposition.

SINGLE-MENU :

Using or involving only a single menu (cf. Hoppity)

SLANT :

Oblique stroke, e.g. as used between shillings and pence.

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