Ключевые слова: airline, alert, allergen, area, attention, bacteria, biohazard, caution, chemical, clothing, concept, control, coronavirus, covid19, danger, dangerous, deadly, death, disease, emergency, epidemic, hazard, hazardous, health, hospital, icon, illustration, infect, infected, infection, keep, laboratory, lethal, logo, medical, outbreak, pandemic, quarantine, respiratory, sign, spread, square, stethoscope, stop, surgical, symbol, virus, warning, warning sign,