I claim the ornamental design for a sock, as shown and described.
FIG. 1 is a front elevational view photograph of a sock showing my new design, the rear elevational view being a mirror image thereof;
FIG. 2 is a left side view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a top, front and right side perspective view of the sock as worn.
FIG. 7 is a top, rear, and left side perspective view thereof;
FIG. 8 is a bottom, front and right side perspective view thereof; and,
FIG. 9 is a bottom, rear and left side perspective view thereof.
The broken line showing of a leg in FIGS. 6–9 is included for the purpose of showing the sock in its environment and forms no part of the claimed design.