The ornamental design for a mop, as shown and described.
FIG. 1 is a front right perspective view of a mop showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
It is understood that the fibers shown in the drawings exist uniformly throughout the surfaces on which they are shown, and are only shown partially for ease of illustration. No specific pattern or arrangement of the fibers is claimed, as all of the fibers exist in an immediately adjacent relationship to each other.
The dotted broken lines are for illustrative purposes only and form no part of the claimed design.