The ornamental design for a desk, as shown and described.
FIG. 1 is a perspective view of a table comprising the new design;
FIG. 2 is a top view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a right side view thereof, where the left side view is a mirror image thereof; and,
FIG. 5 is a front view of an alternative embodiment of the table, having an indeterminate width, which is the sole difference between it and FIGS. 1–4.
The broken line depiction is for illustrative purposes only and forms no part of the claimed invention.