273. Sign - Any display, figure, painting, drawing, placard, poster or other device placed on the ground or on any tree, wall, bush, rock, post, fence, building, structure or thing whatsoever, which is designed, intended or used to convey a message, advertise, inform or direct attention to a person, institution, organization, activity, place, object or product. "Placed," as used in this definition, includes erecting, constructing, posting, painting, printing, tracking, nailing, gluing, sticking, carving or other fastening, affixing or making visible in any manner whatsoever.