Ключевые слова: 3, arrow, attention, background, black, bolt, care, caution, communicate, communication, corner, current, danger, dangerous, down, electric, electrical, electricity, energy, fence, flash, gray, high, industrial, industry, label, lightning, metal, metallic, old, power, safety, security, sign, signage, static, strike, stroke, symbol, three, triangle, triangular, voltage, wall, warning, yellow, zag, zig, zigzag,