Ключевые слова: alert, background, bacteria, bio, biohazard, biohazard sign, biohazard symbol, biologic, biological, biology, blue, caution, chemical, contaminated, danger, dangerous, epidemic, forbidden, green symbol, hazard, lab, light, milky way, night, night sky, notice, protect, protection, research, restricted, risk, safety, science, scientific, security, shiny, sign, signal, sky, space, star, starlight, starry, stars, substance, symbol, toxic, triangle, virus, warn,