Sign
Any structure or part thereof or any device attached to a building or painted or represented thereon which shall display or include any letter, word, model, banner, pennant, insignia, device, trade flag, symbol or representation which is in the nature of, or which is used as an announcement, direction or advertisement for any purpose. A sign includes a billboard, neon tube, string of lights or similar device outlining or placed upon any part of a building or lot, but does not include the flag or insignia of any nation, group of nations, governmental agency or any political, educational, charitable, philanthropic, civic, professional, religious group.