Ключевые слова: alert, area, bacteria, bacterial, beware, bio, biohazard, biologic, biological, biology, black, caution, chemical, contamination, corona, coronavirus, danger, dangerous, element, epidemic, experiment, forbidden, hazard, icon, illustration, isolated, lab, notice, protect, protection, research, restricted, risk, science, scientific, security, sign, signal, symbol, toxic, triangle, virus, warn, waste, weapon, yellow,