A Knob is a small, round, or cylindrical handle that is used to control a mechanism. It is made of metal, or plastic and has a threaded end that is used to secure it in place. Knobs are often used to control the flow of fluids, such as oil, water, and hydraulic fluid. This can be done by turning the knob to open or close a valve.

Attributes:
• Used to adjust settings, such as the speed of a machine by turning the knob to different positions
• Manufactured to precise specifications and are built for durability, reliability

Applications:
A Knob is used to select options, such as the mode of operation for a machine or the type of output for a device.