A signal that only takes discrete values (contrasted to an analog signal that can take continuously varying values).

A signal that can vary in a continuous manner (as opposed to a digital signal that only takes discrete values).

(electrical engineering) The ratio comparing signal power to noise power. / (by extension) The quantity of quality information compared to irrelevant or incorrect information.

Alternative form of time signal

plural of turn signal

plural of false signal

(neologism) Somebody who engages in virtue signalling.

plural of busy signal

(chiefly US, automotive) each of the flashing lights on each side of a vehicle which indicate a turn is being made to left or right, or a lane change etc.

The meaning of a railway signal