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signal

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signal

Any sign, gesture, sound, or action that conveys information.

Examples include the use of flags (semaphore), light (traffic and railway signals), radio telephony, radio telegraphy (Morse code), and electricity (telecommunications and computer networks).

The International Code of Signals used by shipping was drawn up by an international committee and published 1931. The codes and abbreviations used by aircraft are dealt with by the International Civil Aviation Organization, established in 1944.



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? Mentioned in ? References in classic literature
 
To do this, you need but stretch your hand out of the closet, I shall understand your signal perfectly.
The Mystery of the Yellow Room by Leroux, Gaston View in context
Esmeralda had removed her red apron and was waving it frantically above her head; but Clayton, still fearing that even this might not be seen, hurried off toward the northern point where lay his signal pyre ready for the match.
Tarzan of the Apes by Burroughs, Edgar Rice View in context
Besides, a signal made half a league out at sea, and to which The Young Amelia replied by a similar signal, indicated that the moment for business had come.
The Count of Monte Cristo by Dumas, Alexandre View in context
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