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radio R and S brevity codes: published by the British Post Office in 1908 for coastal wireless stations and ships, superseded in 1912 by Q codes X code: used by European military services in wireless telegraphy Z code: used in early radiotelegraph communication == See also == Brevity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