Ключевые слова: atom, background, banner, bulb, business, calculator, circle, concept, design, development, education, element, engineering, experiment, flask, frame, gear, graph, graphic, horizontal, icon, idea, illustration, isolated, learn, learning, line, linear, math, mathematics, modern, outline, poster, ruler, schooling, science, sign, simple, stem, study, style, symbol, system, teaching, technology, thin, triangle, university,