(SIGNAL) [noun] [C] - a short electrical, radio or light signal which carries information or instructions between the parts of a systemThe remote control works by sending infra-red impulses to a receiver in the video recorder.Nerve impulses pass messages from the brain to other parts of the body.
IMPULSE
Meaning of IMPULSE in English
Cambridge English vocab. Кембриджский английский словарь. 2012