“Roof sign” means a business sign erected upon or above a roof or, in cases where a parapet is present, above the parapet of a building. This definition does not apply to signs attached to parapets or walls when such parapets or walls are at a point six feet in height or less above the roof deck. (Ord. 2937 § 3, 2012; Ord. 2310 § 27, 2000)