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Signals for management of telegraph circuits
Operating signals are a type of
brevity code used in operational communication among radio and telegraph operators. For example:
-
Prosigns for Morse code
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92 Code: telegraph brevity codes
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Q code: initially developed for commercial radiotelegraph communication and adopted by other radio services
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QN Signals: published by the
ARRL and used in
Amateur radio
- R and S brevity codes: published by the British Post Office in 1908 for coastal wireless stations and ships, superseded in 1912 by Q codes
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- X code: used by European military services in wireless telegraphy
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Z code: used in early radiotelegraph communication