I claim the ornamental design for a mirror, as shown and described.
FIG. 1 is a perspective view of a mirror according to an embodiment of the invention. The view from the front left side being a mirror image thereof.
FIG. 2 is a plan view of a mirror according to an embodiment of the invention; and,
FIG. 3 is a front elevational view of a mirror according to an embodiment of the invention.
The back side and bottom side of the mirror are not shown and are not claimed as part of the invention.
Color is claimed as part of the invention only for the surface shading framing the mirror surface. The surface shading along the perimeter of the mirror surface depicts the color grey/silver.