Sign. A "sign" is defined as any billboard, signboard, lettering, or other advertising device with the purpose in mind of drawing attention to the person, product, service, premises, business, residence, location, event, organization or notice described thereon. For the purposes of this chapter, the term "sign" does not include mailboxes, names of occupants, other identifications not having commercial connotation, flags not having commercial connotations, insignias of governments, legal notices, signs giving direction or information required by government bodies, or signs directing or guiding traffic and parking without the use of advertising material. The term "sign" shall not include displays that only involve symbols that are clearly and entirely religious in nature, and which do not include advertising.