We claim the ornamental design for a cap, as shown and described.
FIG. 1 is a perspective view of the cap.
FIG. 2 is a perspective view of the cap.
FIG. 3 is a bottom view of the cap.
FIG. 4 is a side view of the cap and is an identical minor image of an opposite side view of the cap not shown in the FIGS. 1-8.
FIG. 5 is a top view of the cap.
FIG. 6 is a front rear view of the cap.
FIG. 7 is a front view of the cap; and,
FIG. 8 is a cross sectional view of the cap taken along line 8-8 of FIG. 5 to illustrate the configuration of the exterior surface of the cap not apparent from the other views of the cap.
The broken lines describing a sanitary end, as shown in FIG. 1, are for illustrative purposes only and form no part of the claimed design.