Ключевые слова: alert, attention, background, black, blank, careful, caution, chemical, cold, color, communication, danger, design, electricity, empty, environment, exclamation, eye, flammable, glass, graphic, hand, hazard, head, high, hot, icon, icons, illustration, industry, information, internet, isolated, message, red, risk, safety, sign, signs, sky, street, symbol, symbols, toxic, travel, warning, web, white, yellow,