Ключевые слова: analysis, banner, book, bright, calculator, cog, color, colored, concept, dark, development, dna, education, element, engineering, flask, gear, horizontal, icon, illustration, knowledge, leaf, learn, learning, line, linear, math, mathematics, microscope, minimal, modern, molecule, outline, ruler, science, shape, sign, stem, style, symbol, system, teaching, tech, technology, thin, university,