{{short description|Signals for management of telegraph circuits}}
'''Operating signals''' are onea type of [[brevity code wherein the signals are designed and]] used primarilyin to support theoperational communication of the communicationsamong (radio and telegraph) operators. amongFor themselves with respect to communications operations, instead of communicating abbreviated messages about non-communications related activities.example:
* [[Prosigns for Morse code]]
* [[Wire signal#92 Code|92 Code]] Western Union: telegraph brevity codes
* [[Q code]] -: initially developed for commercial radiotelegraph communication, and later adopted by other radio services, especially amateur radio. Used sincecirca1909.
* [[QN Signals]] -: published by the [[ARRL]] and used byin [[Amateur radio]] operators to assist in the transmission of [[ARRL Radiogram]]<nowiki/>s in the [[National Traffic System]].
* [[R code]] -and S Code: published by the British Post Office in 1908 for use only by British coastal wireless stations and ships licensed by the Postmaster General.<ref name=":0">{{Cite web|url=http://ac6v.com/rcode.htm|title=R - CODES AND S - CODES}}</ref>
* X code -: used by European military services as ain wireless telegraphy code in the 1930s and 1940s▼
* S code - published by the British Post Office in 1908 for use only by British coastal wireless stations and ships licensed by the Postmaster General.<ref name=":0" />
* [[Z code]] - also: used in the early days of radiotelegraph communication.▼
▲* X code - used by European military services as a wireless telegraphy code in the 1930s and 1940s
▲* [[Z code]] - also used in the early days of radiotelegraph communication.
