FIG. 1 is a perspective view of an exit sign, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a perspective view of another new ornamental design for an exit sign;

FIG. 7 is a front elevation view of the exit sign of FIG. 6;

FIG. 8 is a rear elevation view of the exit sign of FIG. 6;

FIG. 9 is a bottom plan view of the exit sign of FIG. 6; and,

FIG. 10 is a right side elevation view of the exit sign of FIG. 6.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. While only the right-side view is provided those of ordinary skill in the art will recognize that that the opposing side view of the exit sign is a mirror image of the side view which has been provided in FIGS. 5 and 10 described above.

The break lines indicate no specific length and width.