The ornamental design for a handle, as shown and described.
FIG. 1 is a reduced perspective view of a handle;
FIG. 2 is a top view of the handle;
FIG. 3 is a side view of the handle;
FIG. 4 is a side view of the handle;
FIG. 5 is a bottom view of the handle;
FIG. 6 is an end view of the handle; and,
FIG. 7 is an end view of the handle.
The broken lines showing a structure in FIG. 1 and an aperture in FIGS. 3, 4 and 7 are for illustrative purposes only and form no part of the claimed design.