Biohazard Symbol | Universal Warning Sign for Biological Hazards #3597677 (License: Personal Use)

This iconic trefoil-shaped symbol-comprising three interlocking arcs surrounding a central circle and vertical line-was developed in 1966 by Charles Baldwin at Dow Chemical. It is standardized under ISO 3864-3 and used globally to mark containers, equipment, and areas contaminated with biological agents such as viruses, bacteria, or medical waste. Its high-contrast design ensures visibility and immediate recognition even under stress or low-light conditions.

Commonly used in medical facilities, research labs, waste disposal units, and public health signage to indicate exposure risk from biological hazards; matches user intent for safety compliance, hazard identification, or educational content about biosafety protocols.