The ornamental design for a sign, as shown and described.
FIG. 1 is a front upper perspective view of a sign;
FIG. 2 is a front elevation view of the sign;
FIG. 3 is a side elevation view the sign;
FIG. 4 is a rear elevation view of the sign;
FIG. 5 is an enlarged top plan view of the sign;
FIG. 6 is a fragmentary enlarged front upper perspective view from FIG. 1;
FIG. 7 is a fragmentary enlarged lower perspective view of showing the lower portion of the sign, the lower element is shown broken away for ease of disclosure on the drawing sheet; and,
FIG. 8 is a front upper perspective view of the sign shown in use inserted into a surface.
The broken line shown in FIG. 8 is for the purpose of illustrating environmental structure of the surface and forms no part of the claimed design.