Biohazard black filled icon
Outline biohazard symbol with three interlocking crescent lobes around a center circle
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About the Biohazard black filled 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 solid black filled version of the biohazard icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.
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.
