Biohazard Trefoil Sign black outline icon
Biohazard symbol formed by three crescent arcs surrounding a solid circular center
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About the Biohazard Trefoil Sign black outline icon
The standard biological hazard mark: three broad crescent arcs arranged at equal angles around a filled central disc, each arc ending in a rounded tip. It signals infection risk, contamination and restricted biological material. Use it on laboratory door signage, medical and sharps waste containers, pandemic or quarantine dashboards, hospital wayfinding, chemical safety data sheets, and hazmat training slides.
Solid strokes and generous gaps keep the three-fold rotational symmetry readable even when the mark is reduced to a small badge. It pairs naturally with radiation, toxic and flammable warning marks in the library. Center it on a contrasting plate rather than tinting the arcs, so the silhouette stays the recognizable part.
This is the black outline version of the biohazard trefoil sign 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.
