Ключевые слова: abstract, app, battery, collection, computer icon, design element, document, empty, equipment, file, flat design, full, gear, hand tool, icon, information, interface, isolated, letter, loudspeaker, low power, magnifying glass, microphone, monitor, network, power supply, protection, push button, screwdriver, search, security, set, shield, sign, sound, symbol, tool, wrench,