A rotary knob is a mechanical or electromechanical component used to provide manual input adjustments to a system by rotating it. When grasped and turned by a human operator, the extent of knob rotation corresponds to the desired input, such as adjusting volume, speed, or temperature. Commonly found in devices like audio equipment, household appliances, and industrial machinery, rotary knobs offer tactile feedback and precise control. They can be coupled with components like potentiometers or rotary switches to translate rotational movement into electrical signals or to select different circuit paths. The design typically includes a shaft that connects to the internal mechanism, and the knob itself may feature markings or indicators to denote settings. Materials used for rotary knobs vary, with options like plastic, Bakelite, and aluminum available to suit different applications and aesthetic preferences