Ключевые слова: advice, alarm, alert, attention, background, beware, button, careful, caution, concept, construction, danger, dangerous, design, error, exclamation, failure, flat, graphic, hazard, icon, idea, illustration, important, information, internet, isolated, label, line, mark, message, point, problem, risk, road, safety, security, sign, signal, stop, symbol, traffic, triangle, warn, warning, web,