The ornamental design for a handle, as shown and described.
FIG. 1 is a perspective view of a handle showing the claimed design;
FIG. 2 is a front view thereof, the back view being identical to the front view;
FIG. 3 is a top view thereof;
FIG. 4 is a bottom view thereof;
FIG. 5 is a left-side view thereof, the right-side view being identical to the right-side view; and,
FIG. 6 is an enlarged left-side view thereof according to the dash-dot-dashed rectangle shown in FIG. 5.
Broken lines in the figures show portions of the handle that form no part of the claimed design. The dash-dot-dash lines in FIG. 6 depicts bounds of the enlarged portion.