The ornamental design for a grill, as shown and described.
FIG. 1 is a right side perspective view of a grill of the present invention;
FIG. 2 is a bottom perspective view of the grill of the present invention;
FIG. 3 is a top view of the grill of the present invention;
FIG. 4 is a front view of the grill of the present invention;
FIG. 5 is a left side view of the grill of the present invention, the right side view being a mirror image of the left side view;
FIG. 6 is a rear view of the grill of the present invention; and,
FIG. 7 is a bottom view of the grill of the present invention.
The broken lines shown in the Figures depict environment and form no part of the claimed design. The dash-dot broken lines in the Figures depict boundaries of the claimed design that form no part thereof.