Ключевые слова: alarm, alert, atom, atomic, attention, background, badge, button, caution, chemical, chemistry, contaminate, contaminated, coronavirus, covid19, danger, dangerous, disaster, energy, grunge, hazard, hazardous, icon, illustration, isolated, material, nuclear, pictogram, plutonium, pollution, power, racket, radiation, radioactive, radioactivity, ray, reactor, risk, safety, science, sign, substance, symbol, tennis, threat, toxic, uranium, warning, waste,