Biohazard Trefoil black filled icon
Biohazard trefoil made of three curved crescent blades around a small center circle
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About the Biohazard Trefoil black filled icon
Three overlapping crescent blades curve outward from a small solid center circle, forming the standard trefoil used to mark biological danger. It signals infectious material, contamination risk and restricted lab areas. Fit for laboratory door signage, medical waste container labels, safety training slides, hospital wayfinding and game or app interfaces that flag hazardous zones.
The three arcs are spaced at 120 degrees around the ring, each drawn with even stroke weight so the negative space between them stays open. Pair it with radiation, toxic and warning triangle marks; it holds shape down to 16 px.
This is the solid black filled version of the biohazard trefoil icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.
Get it free as an SVG vector or transparent PNG (16-512px), copy the SVG code, or restyle it in the free online editor — recolor any part, add gold, neon or gradient effects, animate it, or export EPS, PDF and DXF.
Free for personal and commercial use with attribution.
