The ornamental design for a belt, as shown and described.
FIG. 1 is front perspective view of a belt showing my new design;
FIG. 2 is a front elevation view thereof;
FIG. 3 is a rear elevation view thereof;
FIG. 4 is a right side elevation view thereof;
FIG. 5 is a left side elevation view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is bottom plan view thereof; and,
FIG. 8 is a perspective view thereof, shown positioned on a user.
The even dashed broken lines entirely surrounded by shading represent stitching that form no part of the claimed design. The remaining evenly dashed broken lines depict portions of the article that form no part of the claimed design. The dot-dashed broken lines in FIG. 8 depict environment that forms no part of the claimed design.