I claim the ornamental design for a shawl, as shown and described.
FIG. 1 is a back view of the present invention as it is to be worn by the user;
FIG. 2 is a front view thereof as it is to be worn by the user;
FIG. 3 is a front view thereof in a flatten form;
FIG. 4 is a back view thereof in a flatten form;
FIG. 5 is a front view thereof as worn by the user;
FIG. 6 is a back view thereof as worn by the user;
FIG. 7 is a left side view thereof as worn by the user;
FIG. 8 is a right side view thereof as worn by the user; and,
FIG. 9 is a front view as worn by the user.
The tightly spaced broken lines on the pockets of the shawl represent claimed stitching. The broken lines forming a person in the drawings represent environmental subject matter that forms no part of the claim.