signal
sig-nal
verb
To indicate or be a sign of a future event or a particular situation.
"The dark clouds signalled a storm."
noun
An electrical impulse or radio wave used to transmit data, sound, or images.
"My phone has a weak signal here."
verb
To make a gesture or sound to convey information, a command, or a warning.
"She signalled for the taxi to stop."
noun
A gesture, sound, or object conveying information, a command, or a warning.
"The referee blew his whistle as a signal."
Thesaurus
Synonyms: sign, signalise, signalize, signalling, signaling, impressive, point, betoken, bespeak, indicate