Ключевые слова: accident, advice, alarm, alert, attention, background, beware, black, board, business, careful, caution, closeup, communication, danger, dangerous, death, electric, electricity, exclamation, forbidden, gas, hazard, high, icon, industry, information, isolated, mark, metal, notice, other, outdoors, power, prevention, protection, risk, safety, security, sign, signal, stop, symbol, triangle, triangular, vertical, volt, voltage, warn, yellow,