Biohazard Trefoil black outline icon
Biohazard trefoil made of three broken interlocking rings around a center point
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About the Biohazard Trefoil black outline icon
The universal biohazard trefoil: three broken rings arranged at equal angles around a small central point, each ring interrupted so the arcs interlock into one radial mark. It warns of infectious material, contaminated waste and restricted laboratory areas, fitting for lab signage, medical waste labeling, safety training decks, hospital wayfinding and hazard warning interfaces.
Perfect three-fold rotational symmetry and thick even arcs keep it recognizable at any size, while the negative space between the rings stops the shape filling in when reduced. Pair it with radiation, flammable and toxic warning icons, and give it clear padding on labels.
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.
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.
