The ornamental design for a floorboard, as shown and described.
The patent or application file contains at least one drawing executed in color. Copies of this patent or patent application publication with color drawing(s) will be provided by the U.S. Patent and Trademark Office upon request and payment of the necessary fee.
FIG. 1 is a top and side perspective view of the floor board showing my new design;
FIG. 2 is an opposite side perspective view thereof;
FIG. 3 is an additional top and side perspective view thereof; and,
FIG. 4 is an additional opposite side perspective view.