Analogue (or Analog) is a type of electronic device that has a variable amount of physical signals, such as the hands on a watch. Analogue is often compared to Digital, which has only two signals, binary. Analogue devices are often more complicated in terms of their circuits to design, which can be attributed to the variance in the signals compared to digital circuits signals.

"Definition of Analog in English:." Analog: Definition of Analog in Oxford Dictionary (American English) (US). N.p., n.d. Web. 20 Feb. 2015.

Williams, Jim (1991). Analog circuit design. Newnes. p. 238. ISBN 0-7506-9640-0.