Ключевые слова: abstract, analysis, ancient, astronomy, badges, biology, blue, building, collection, college, color, design, different, education, element, flat, graphic, historical, history, icon, illustration, infographic, line, linear, logo, museum, national, old, outline, physics, research, ribbon, scheme, school, science, set, shield, signs, study, symbol, technology, theme, thin, university, web,