Biohazard black outline icon
Outline biohazard symbol with three interlocking crescent lobes around a center circle
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About the Biohazard black outline icon
The standard biohazard trefoil: three crescent-shaped lobes arranged at equal angles around a small central circle, each lobe built from two arcs that interlock with its neighbors. It signals biological hazard, contamination risk, infectious material and restricted lab areas. Use it on laboratory safety signage, medical waste bin labels, quarantine notices, pandemic information graphics and chemistry or biology course slides.
The three lobes rotate around the centre in perfect symmetry, with open gaps between them that keep the outline readable rather than solid. It pairs with radiation, toxic skull and warning triangle icons in the library. Pair it with a yellow triangle backdrop when used as real-world signage.
This is the black outline version of the biohazard 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.
