Biohazard black outline icon
Biohazard trefoil with three interlocking crescents around a small central circle
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About the Biohazard black outline 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 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.
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.
