FIG. 1 is a perspective view of a doorknob of the subject design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof, the right side elevational view being symmetric to the left side elevational view; and,
FIG. 5 is a top plan view thereof, the bottom plan view being symmetric to the top plan view.