{{short description|Signals for management of telegraph circuits}} {{Use dmy dates|date=May 2023}} '''Operating signals''' are a type of brevity code used in operational communication among radio and telegraph operators. For example:

* Prosigns for Morse code * 92 Code: telegraph brevity codes * Q code: initially developed for commercial radiotelegraph communication and adopted by other radio services * 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radio * R and S brevity codes: published by the British Post Office in 1908 for coastal wireless stations and ships, superseded in 1912 by Q codes<ref name="pre-1912">{{Cite web|url=https://ac6v.com/rcode.php|title=Pre-1912 Brevity Codes|last=Anderson|first=Scott|date=2002-07-31}}</ref> * X code: used by European military services in wireless telegraphy * Z code: used in early radiotelegraph communication

==See also== * Brevity code * SINPO code - code used to describe the quality of radio transmissions, especially in reception reports written by shortwave listeners * R-S-T system- information about the quality of a radio signal being received. Used by amateur radio operators, shortwave listeners. * Morse code abbreviations * Telegraphese

==External links== * [http://cryptiana.web.fc2.com/code/telegraph2.htm Nonsecret Code: An Overview of Early Telegraph Codes]

==References== {{reflist}}

{{Morse code}}

Category:Operating signals