Ключевые слова: abstract, attention, background, black, blank, bolts, button, caution, clear, danger, dangerous, empty, exclamation, hazard, icon, idea, illustration, industry, information, isolated, label, lead, logo, mark, message, no, non, notice, oh, place, plate, poster, protection, risk, road, safety, shape, sign, signal, silhouette, symbol, thorough, transportation, triangle, warn, white, yellow, zone,