(167) "Sign" means a structure or any part thereof, or any device attached to or painted directly or indirectly on a building or structure or a parcel of land, and which displays or includes any letter, model, banner, pennant, insignia, device or other presentation to direct attention to a person, institution, organization, activity, place, object, product or business. The word "sign" includes the word billboard, but does not include flag, pennant or insignia of any nation, state, city or other political unit, or of any political, education, charitable, religious or like campaign, drive or movement or event.