Operating signals

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 * R and S brevity codes: published by the British Post Office in 1908 for coastal wireless stations and ships, superseded in 1912 by Q codes
 * X code: used by European military services in wireless telegraphy
 * Z code: used in early radiotelegraph communication