Biohazard Symbol - Universal Warning Sign for Biological Hazards #1475271 (License: Personal Use)

This high-contrast black-and-white biohazard symbol consists of three interlocking crescent shapes surrounding a central circle, forming a trefoil pattern. Created in 1966 by Charles Baldwin at Dow Chemical, it was engineered for universal legibility regardless of language or literacy. It is standardized under ISO 3864-3 and used globally to mark infectious agents, medical waste, and contaminated environments.

Used on lab doors, medical waste containers, PPE packaging, and safety signage; matches user intent for hazard identification, safety training, regulatory compliance, or educational content about biosafety.