Ключевые слова: alert, area, attention, bacteria, bio, biohazard, biologic, biological, biology, caution, chemical, danger, dangerous, design, element, emergency, epidemic, forbidden, front view, graphic, hazard, icon, illustration, lab, prohibition, protect, protection, research, restricted, restriction, risk, safety, science, scientific, security, sign, signal, silhouette, stop, symbol, toxic, virus, warn, web, zone,