The ornamental design for a handle, as shown and described.
FIG. 1 is a perspective view of a handle showing my new design;
FIG. 2 is an alternative perspective view thereof;
FIG. 3 is a front elevational view thereof, the opposite side being a mirror image of the side shown;
FIG. 4 is a first side view thereof;
FIG. 5 is a second side view thereof; and,
FIG. 6 is a top plan view thereof.
The broken lines showing portions of the faucet are included for the purpose of illustrating a portion of the faucet that forms no part of the claimed design.