The ornamental design for a monitor, as shown and described.
FIG. 1 is the perspective view of a monitor showing my new design;
FIG. 2 is the front view thereof;
FIG. 3 is the rear view thereof;
FIG. 4 is the left-side view thereof;
FIG. 5 is the right-side view thereof;
FIG. 6 is the top plan view thereof;
FIG. 7 is the bottom plan view thereof;
FIG. 8 is the rear-side perspective view thereof; and,
FIG. 9 illustrates that the monitor of FIG. 5 moved forward.
The broken lines are for illustrative purposes only and form no part of the claimed design.
References to “side”, “top”, and “bottom” in the figure descriptions are not meant to require certain in-use orientation; a monitor according to the claimed design may be used in any orientation.