Ключевые слова: alert, area, attention, bacteria, beware, bio, biohazard, biologic, biological, black, bomb, caution, chemical, contagious, contamination, danger, dangerous, death, disease, epidemic, forbidden, hazard, hazardous, icon, isolated, lab, laboratory, medical, medicine, notice, poison, pollution, protect, protection, restricted, risk, round, safety, security, sign, simple, symbol, toxic, virus, warn, warning, waste, weapon, zone,