Ключевые слова: advice, arrow, attention, background, blank, board, caution, danger, death, decay, door, electric, electrical, electricity, emblem, energy, forbidden, grille, hazard, hazardous, high, icon, industrial, industry, inform, key, lightning, lock, metal, notice, power, protect, protection, protective, risk, safety, security, shock, sign, station, steel, supply, surface, symbol, technology, texture, thunder, triangle, voltage, warning,