Rotary switch knob

FIG. 1 is a front elevational view of a rotary switch knob showing my new design, the rear view being a mirror image;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top perspective view thereof;

FIG. 7 is a bottom perspective view thereof; and

FIG. 8 is a top perspective view thereof, the rotary switch is shown in broken lines for illustrative purposes only and forms no part of the claimed design.