Hook

FIG. 1 is a front view of a hook showing my new design; FIG. 2 is a rear view thereof; FIG. 3 is a right side view thereof; FIG. 4 is a left side view thereof; FIG. 5 is a top view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a perspective view thereof; and, FIG. 8 is another perspective view thereof. The broken lines depict portions of the hook that form no part of the claimed design. The dash-dot-dash broken lines illustrate a boundary of the design that form no part of the claimed design.