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PSI, a :
Epithet of (any of) the five wheels of the Tunny machine characterized
by having the same intermittent movement.
PSILLI :
( short for psychological or psychic Cilli). An Enigma message setting
which is so related to the outside indicator (e.g. by completing a word
which the outside indicator begins, or continuing the same sequence or
series of letters, as in the series - the message settings are underlined
WIR BRA : UCH ENZ : IGA RET : TEN ... ) that its clear form can be
inferred from the latter; also, any setting which can be guessed from a
knowledge of the idiosyncrasies of the operator concerned.
PSYCHIC, PSYCHOLOGICAL :
Q-CODE :
International three-letter code, the first letter of each group being
Q, or any national adaptation of this, used mainly for signal-service
communications by operators.
QUALIFIER :
RADICAL :
One of the 214 basic characters under which Chinese ideographs are
grouped for dictionary purposes.
RADIO FINGER PRINT :
Enlarged or elongated film-record of morse transmission by means of which
the type of transmitter used and the peculiarities of the individual sets
of any type can be distinguished, serving to identify stations.
RADAR :
New name for Radiolocation or Radio-direction-finding.
RAILWAY CATALOGUE :
( in Enigma). A special form of catalogue (see Eins catalogue) designed
for a machine with a rotating Umkehrwalze (first used on Railway traffic).
RANDOM :
Produced by chance or accident, or such as may have been so produced;
(esp. of a series of letters, figures or other symbols) such that any
one of the total number of different symbols used is equally likely to
occur at any point; alternatively, having no discernible patterns or
limitations nor any symbol the number of whose occurrences differs
from the average number of occurrences by more than a definable and
relatively small number, e.g. N(n-1) where N is the total number of
symbols in the series and n the number of different symbols used, or
a small multiple of this suitable to the size N.
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