Ключевые слова: 3d, alternative, art, attention, circuit, concept, contour, danger, eco, ecology, electric, electrical, electricity, electronic, energy, environment, green, high, icon, idea, illustration, isolated, isometric, lamp, leaf, light, lightbulb, lightning, line, linear, lineart, outline, pink, plant, power, risk, safety, set, sign, square, symbol, technology, triangle, voltage, warning,