Biohazard Trefoil Circle black outline icon
Outline biohazard trefoil with three interlocking rings inside a circle
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About the Biohazard Trefoil Circle black outline icon
The standard biohazard trefoil is drawn as three interlocking broken rings around a small central circle, all set inside a thin outer ring. It signals biological risk: infectious material, contaminated waste, restricted lab zones and quarantine areas. Fits laboratory and hospital interfaces, waste disposal labeling, safety training decks, biosecurity documentation and public health or outbreak dashboards.
The three lobes sit at even 120 degree spacing with open gaps where the arcs cross, which keeps the shape recognizable without filling in. Pairs naturally with radiation, toxic and general warning icons. Because the arcs are thin and close, use it at 24 px or larger so the gaps do not close up.
This is the black outline version of the biohazard trefoil circle icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
It downloads free as an SVG vector or transparent PNG in seven sizes, and the free online editor lets you recolor it, apply gold, silver, neon and gradient styles, add animation, or convert it to EPS, PDF and DXF.
Free for personal and commercial use with attribution.
