slider

Example:She used the scroll bar to zoom in on a specific section of the report.

Definition:A control that is used to move the view of a window, document, or image by scrolling up and down or sideways, usually found on the edge of a GUI.

Example:Adjusting the knob on the old radio was an art, as it had no markings to guide you.

Definition:A handwheel or handle that rotates around an axis and is used to control something, like a volume control or temperature.