FIG. 1 is a perspective view of a control knob, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left-side view thereof;

FIG. 5 is a right-side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a perspective view of a control knob of FIG. 1, in which a gas-range oven in broken lines is provided to illustrate an example environment.

The broken lines are for illustrative purposes only and form no part of the claimed design. The shade lines in the figures show contour and not surface ornamentation.