For the purposes of this article, the following terms shall have the following meanings:
The total surface area of the sign. The display area of an individual letter sign or irregular-shaped sign shall be the area of the smallest rectangle into which the letters or shape will fit. Where sign faces are placed back to back and face in opposite directions, the display area shall be defined as the area of one face of the design.
Any constructing, relettering, extending, altering or changing of a sign other than repainting, repairing and maintaining.
Any symbol, design or device used to identify or advertise any place of business, product, activity, or person.