Area of Sign. The area of a sign shall be construed to include all letter, wording, and accompanying designs and symbols, together with the background, whether open or enclosed, on which they are displayed (but not including any supporting framework and bracing incidental to the display itself). Where the sign consists of individual letters or symbols attached to a building, wall, or window, the area of the sign shall be considered to be that of the smallest rectangle or other regular geometric shape which encompasses all of the letters and symbols. In computing the square foot area of a double-faced sign, only one side shall be considered, provided that the both faces are identical. If the interior angle formed by the two faces of the double sided sign is greater than 45°, then both sides of such sign shall be considered in calculating the sign area. A cube shall be considered four signs.