Ключевые слова: alert, attention, bio, biohazard, biological, biological hazard, black, catastrophe, chemical, chemical weapons, circle, danger, dangerous, electricity, element, emblem, exclamation point, harmful, hazard, hazardous, high voltage, icon, illustration, information, isolated, laser, magnet, magnetic field, natural disaster, nuclear, optical, pictogram, protection, radiation, radio emission, radioactive, risk, round, safety, security, sign, signal, symbol, threat, toxic, voltage, warning, yellow,