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INTERVAL :
Distance between two symbols or groups, esp. in a cipher message
expressed algebraically as the number of unit distances (i.e. distance
between two consecutive symbols or groups), intervals from left to
right being positive and from right to left negative.
INTERVAL KEY :
(in Transposition). Key giving intervals between the positions
denoted by the consecutive terms of an encipher key.
INVERSE ROD :
A rod showing the letters on the left side of a wheel of an Enigma
machine that are consecutively connected to a fixed point in space at
the right side for the twenty-six different positions which occur in
one revolution of that wheel. There are twenty-six such rods for each
wheel, corresponding to the twenty-six different points on the right
side of the wheel, which, like the direct rods, form a rod-square, but
have the diagonal running upwards from right to left. (The sequence
of letters on an inverse rod is in fact an index of the sequence of
direct rods on which the letter which denotes that inverse-rod is to
be found for each of the twenty-six positions).
INVERT :
(in German Y Service traffic). A short message from a German ground
station answering a request and giving the bearing desired.
JAM :
To make wireless signals incapable of satisfactory reception by trans-
mitting interfering signals on the same frequency.
JARGON CODE :
A code using words (esp. nouns) instead of figure or letter-groups
as the equivalent of plain language units.
JUMBO :
KANA :
Linguistic units consisting of single vowels or a consonant followed
by a vowel used to transliterate Japanese characters into Roman letters,
and in various Japanese codes and ciphers.
KENNUNG :
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