Biohazard Symbol - Official Warning Sign for Biological Hazards #1829722 (License: Personal Use)

This high-contrast black-and-white biohazard symbol features three interlocking arcs forming a trefoil shape, created in 1966 by Charles Baldwin for the U.S. Centers for Disease Control. It is standardized under ISO 3864-3 and used globally to denote biological agents that pose a threat to human health, such as viruses, bacteria, or contaminated materials. Its design ensures immediate recognition even when viewed from a distance or in low-light conditions.

Used on containers, lab doors, protective equipment, and waste disposal units to signal biological hazards; commonly seen in medical, research, and industrial safety contexts where users seek hazard identification, compliance guidance, or educational resources.