signal
Definition
A gesture, action, sound, or object used to convey information, instructions, or a warning to others.
An electrical, electromagnetic, acoustic, or other type of wave or impulse that carries information, such as in telecommunications or data processing.
To communicate or indicate something by means of a signal, gesture, or sign.
Examples
After three hours in the dead zone, my phone finally caught a signal, and I immediately doom-scrolled my way back to sanity.
The barista's subtle eye-roll was the universal signal that my 'surprise me' coffee order was about to be a regret.
In a crowded room, he signaled his availability by dramatically checking his watch every 30 seconds.
The dog's enthusiastic tail wag was less a friendly signal and more a frantic Morse code for 'feed me now.'