A sign, gesture, sound, or device that conveys information or instructions. Used in both technical and everyday contexts.
赤は止まれのシグナルだ。
Red is a signal to stop.
彼は手でシグナルを送った。
He sent a signal with his hand.
He sent a signal to his companion.
We received a signal from the satellite.
The referee gave the signal to start.
video signal