Ключевые слова: accident, alert, antibiotics, area, attention, background, barrier, beware, biology, black, caution, corona, coronavirus, crime, cube, danger, epidemic, flu, global, hazard, icon, illness, important, industrial, infection, inscription, letter, lettering, microbe, pandemic, prevention, radiation, restricted, risk, science, security, sign, stop, stripes, symptoms, text, vaccine, virus, wall, warning, wood, wooden, word, world, yellow,