The ornamental design for a plate, as shown and described.
FIG. 1 is a top perspective view of a new, original and ornamental design for a plate;
FIG. 2 is a front elevation view of FIG. 1, wherein each of a rear elevation view, a left side elevation view and a right side elevation view is identical to the image of FIG. 2;
FIG. 3 is a top plan view of FIG. 1;
FIG. 4 is a bottom plan view of FIG. 1; and,
FIG. 5 is a bottom perspective view of FIG. 1.
The stipple fill represents a surface texture provided on a portion of the plate on which it is depicted.