Ключевые слова: abstract, button, close, control, danger, digital, direction, driving, electric, electrical, electricity, element, glowing, graphic, green, icon, indicator, interface, isolated, lamp, light, object, off, panel, plastic, power, press, push, realistic, red, round, semaphore, shiny, sign, signal, start, status, stop, switch, symbol, transport, voltage, warning, web, yellow,