The ornamental design for a handle, as shown and described.
FIG. 1 is a top, right side perspective view of a handle, of which the top, left side perspective view is a mirror image thereof, according to my new design; and,
FIG. 2 is a right side view of the handle shown in FIG. 1, of which the left side view of the handle is a mirror image.
The broken lines are for illustrative purposes only and form no part of the claimed design.