Ключевые слова: abstract, alternative, art, battery, bulb, call, center, conservation, contour, database, design, drop, eco, ecology, electricity, energy, environment, environmental, flat, generation, green, headphone, icon, illustration, innovation, isolated, lamp, light, lightning, line, linear, lineart, nature, operator, outline, panel, power, server, service, shop, store, sun, support, supporter, symbol, technology, turbine, wind, windmill,