The ornamental design for a belt, as shown and described.
FIG. 1 is a front-right perspective view of a belt 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, the left side view being a mirror image of the right side view, right side view enlarged for clarity;
FIG. 5 is a top view thereof;
FIG. 6 is a bottom view thereof; and,
FIG. 7 is a view thereof shown in use.
The broken line showing of an opening in FIGS. 1, 2, and 3 and the broken line showing of the article in use in FIG. 7 is included for the purpose of showing environmental portions of the belt and forms no part of the claimed design.