Bulletin sign. One nonilluminated or indirectly illuminated bulletin sign, as defined herein, shall be permitted on a lot which contains an authorized place of worship, school, library or other public or semipublic building, provided that the sign shall not exceed 24 square feet in surface area. A bulletin sign may be either a wall sign or a freestanding ground sign, as defined herein. The maximum height of a freestanding ground bulletin sign shall be six feet. A bulletin sign may be proposed in addition to the identification sign, as defined herein, authorized for the use; however, if a bulletin sign includes the identification sign, the surface area of the combined sign shall not exceed 32 square feet.