Biohazard Symbol | Universal Warning Sign for Biological Hazards #1689035 (License: Personal Use)

This high-contrast yellow-and-black biohazard symbol features a trefoil pattern enclosed in a circle, standardized by ANSI Z35.1 and ISO 3864-3 for maximum visibility and recognition. Created in 1966 by Charles Baldwin at Dow Chemical, it conveys the presence of potentially infectious agents or hazardous biological materials. It is mandated on containers, equipment, and signage in healthcare, research, and waste management facilities worldwide.

Used on lab doors, sharps containers, biosafety cabinets, and transport labels to signal biological risk; matches user intent for safety compliance, hazard identification, or educational reference.