plural of signal-to-noise ratio

(rail transport, UK) A signal given to a train driver by the guard of the train, or a member of station staff, that the train is ready to depart.

(rail transport, British spelling) An electric railway signal with colour aspects, showing either red or green in a 2-aspect signal, with the addition of a yellow or double yellow aspect (meaning caution) in 3- and 4-aspect signals.

(electronics, technology) The use of digital processing, such as by computers or more specialized digital signal processors, to perform a wide variety of signal processing operations.

(Britain) A time signal transmitted on radio by the BBC every hour and consisting of five short beeps followed by a longer one, with the longer one coinciding with the start of the hour.

(telephony) An audible signal on a voice phone line that sounds more frequently than a standard busy signal, indicating that no transmission path to the called phone number is available.

(US, Australia) Any of the large metal boxes containing traffic signal controls, found at roadsides and intersections, and often made available by the local council for artistic work.

plural of traffic signal box

plural of smoke-signal

plural of smoke signal