Knob

FIG. 1 is a perspective view of a knob showing my new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a rear elevational view thereof; FIG. 4 is a left elevational view thereof; FIG. 5 is a right elevational view thereof; FIG. 6 is a top view thereof; FIG. 7 is a bottom view thereof; and, FIG. 8 is a perspective view of the knob viewed from another direction. The broken line portion of the drawings is included to show unclaimed subject matter only and forms no part of the claimed design.