Hook

FIG. 1 is a perspective view from above of a hook showing my new design; FIG. 2 is a front view thereof; FIG. 3 is a back view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a right side view thereof; FIG. 6 is a top view thereof; and, FIG. 7 is a bottom view thereof. Broken lines illustrate environmental elements and/or portions of the hook that form no part of the claimed design. The broken lines in the drawings depict portion of the hook that form no part of the claimed design.