Biohazard Trefoil black outline icon
Biohazard trefoil made of three curved crescent blades around a small center circle
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About the Biohazard Trefoil black outline 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 black outline version of the biohazard trefoil icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
Download it free as a scalable SVG vector or transparent-background PNG in seven sizes (16 to 512px), copy the SVG code straight into your project, or open it in the free online editor to change colors, apply gold, silver, neon and gradient styles, animate it, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
