Ключевые слова: acid, building, business, caution, cold, construction, crystal, danger, drawing, electric, electrical, environment, explosive, extreme, flame, flammable, glass, hand, hazard, hazardous, health, ice, icon, icons, illustration, industrial, industry, injury, nuclear, protection, protective, radiation, radioactive, risk, safety, set, shock, sign, signage, signal, signs, silhouette, site, slippery, symbol, symbols, truck, warning, yellow,