Ключевые слова: accident prevention, attention, background, black, bright, caution, cautiously, dangers, exhortation, few, grate, grating, grid, grille, heed, hightension, highvoltage, industrial, industry, lattice, levin, lightning, line, making, manufacture, metal, notice, prevention of accidents, production, red, rhythm, riskiness, safety engineering, several, side, sign, some, surface, symbol, technical, triangle, trigon, vivid, voltage, warning, yellow,