The 1944 Bletchley Park Cryptographic Dictionary

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WINDOW :

1. Aperture in cipher stencil through which one or more letters can be written or read.

2. Aperture in inner cover of wheels of a cipher machine through which one of the series of letters or numbers round a wheel can be read, serving as a reference point for setting the wheel.

3. Sequence of cipher or code-groups providing context of group in question (and usually, together with that group, forming 10 groups in all and constituting a unit (normally one line) in a list of cipher or code-groups; also, a list of cipher or code-groups of this character.

WINDOW POSITION :

Position of the wheels of an Enigma machine as shown by the letters or figures in the windows, the ringstellung being correctly set.

W.O. :

Short for Wheel-order.

WORD DIVIDER :

A separator.

WORD SUBTRACTOR :

A subtractor used with a number of different routines, characterized by a to-and-fro or up-and-down movement - the particular routing used being normally denoted by part of the indicator.

W/T :

Short for Wireless telegraphy or wireless telegraphic, esp. as opposed to R/T (radio-telephony, radio-telephonic, which implies speech).

WYLIE BOX :

Wooden frame in which inverse rods can be arranged according to any desired stecker, used to determine rod-pairings when steckered constatations have been punched on masks.

Y SERVICE :

"The organisation responsible for the interception of all enemy and neutral radio transmissions including the operation of D/F Services".

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