radiotelegraphic signal sign dot dit signal signaling dash dah

S/N signal-to-noise signal-to-noise ratio signal/noise ratio

S/N signal-to-noise ratio signal/noise ratio signal/noise ratio

concise

radiotelegraphic signal symbol alarum high sign dog-ear indicator output signal starting signal input whistling output start warning signal telegraphic signal bugle call curfew animal communication time signal signaling number whistle sign distress call radio beacon recording phone number ticktack storm signal distress signal retreat visual signal alarm telephone number radio beam communication electronic signal input signal drumbeat alert beam all clear

semaphore whistle sign signalise intercommunicate heliograph signalize flag communicate wigwag

tell prognosticate foreshadow forecast predict point betoken omen bespeak auspicate mark prefigure foretell presage augur portend bode indicate

provocation incitation incitement

impressive

electricity interrupt electrical energy