Ключевые слова: allowed, art, battery, bolt, button, caution, charge, concept, contour, danger, design, electric, electrical, electricity, energy, flash, flat, forbidden, graphic, green, icon, illustration, isolated, label, light, lightning, line, linear, lineart, long, number, outline, pictogram, power, prohibition, shadow, sign, square, stop, symbol, technology, thunder, voltage, warning, white,