"Analogue electronics (or analog in American English) are electronic systems with a continuously variable signal, in contrast to digital electronics where signals usually take only two levels. The term \"analogue\" describes the proportional relationship between a signal and a voltage or current that represents the signal. The word analogue is derived from the Greek word \u03B1\u03BD\u03AC\u03BB\u03BF\u03B3\u03BF\u03C2 (analogos) meaning \"proportional\"."@en .