Ключевые слова: 3d, accounting, art, astronomy, background, business, button, calculator, color, colorful, communication, connection, contour, design, dish, display, education, electronic, flat, gradient, icon, illustration, instrument, internet, isolated, isometric, lens, line, linear, lineart, magnify, mathematics, object, observation, observe, optical, outline, satellite, science, sign, signal, space, spyglass, symbol, technology, telescope, tool, view, wireless,