small, circular object metal or plastic threaded shaft for attaching to a control panel or other device knob is used to adjust a setting or control a function may be labeled with numbers or symbols may have a pointer or arrow to indicate direction
knob which has small, circular object knob which has metal or plastic knob which has threaded shaft for attaching to a control panel or other device knob which has knob is used to adjust a setting or control a function knob which may be labeled with numbers or symbols knob which may have a pointer or arrow to indicate direction