Flicker noise is a common term used in electronic circuits that refers to the low-frequency fluctuations in the signal. It can also be referred to as 1/f noise or pink noise. Other synonymous terms include Schottky noise, excess noise, and low-frequency noise. These types of noise are caused by the random movement of electrons in the circuit, which can lead to fluctuations in the voltage or current. Flicker noise can be problematic for circuits that require stable and accurate signals, such as amplifiers or sensors. Understanding and minimizing the effects of flicker noise is an important aspect of electronic circuit design.