An electronic device that compares two voltages, currents or streams of data.
Any device for comparing a physical property of two objects, or an object with a standard.
An application or program that compares prices, rates, tariffs of flights, smartphones, cars, etc.
anything that serves comparison
A semaphore device with a steady light that served the same purpose on early vehicles.
A blinking light on a motor vehicle that indicates the direction in which it is about to turn.