Biohazard black filled icon
Biohazard trefoil with three interlocking crescents around a small central circle
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About the Biohazard black filled icon
The standard biological hazard trefoil: three interlocking crescent rings arranged around a small central circle, each arc curving back on itself in perfect threefold symmetry. It warns of infectious material, contamination and restricted areas. Use it on laboratory signage, medical waste labels, safety training slides, quarantine notices and biotech presentations.
The open line treatment keeps the interior arcs visible, so the recognizable trefoil silhouette survives without a solid fill. It pairs with radiation, toxic and warning triangle icons in a hazard set. Use the filled version for printed signage and stickers.
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.
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.
