Explosion-proof (Ex-proof) signage for hazardous environments involves specialized, robust signs and lights (like ATEX/IECEx certified) that prevent ignition, guiding evacuation in areas with flammable gases, dust, or vapors (Zones 1, 2, 21, 22) in places like chemical plants, oil refineries, and mines. Key features include anti-spark tech, flameproof enclosures, high visibility (green/white, photoluminescent), emergency backup, and compliance with standards (NFPA, OSHA, BS E