Ключевые слова: abstract, astronomical, astronomy, atomic, brain, building, button, caution, concept, creative, danger, design, education, electric, hazard, head, human, icon, idea, illustration, innovation, institution, intelligence, isolated, mind, night, nuclear, observatory, optical, orange, radiation, radioactive, risk, safety, science, scientific, set, sign, sky, space, symbol, technology, telescope, think, triangle, warning, white,