The ornamental design for the handle, as shown and described.
FIG. 1 is a perspective view of the handle showing my new design;
FIG. 2 is a rear elevation view of the handle;
FIG. 3 is a front elevation view of the handle;
FIG. 4 is a side elevation view of the handle;
FIG. 5 is an opposite side elevation view;
FIG. 6 is a bottom plan view of the handle;
FIG. 7 is a top plan view of the handle; and,
FIG. 8 is a rear view of the handle shown in use with an umbrella.
Any components in the appended drawings shown in broken lines are for illustrative purposes only and form no part of the claimed design or a specified embodiment thereof.