Biohazard black outline icon
Biohazard symbol with three crescents arranged around a central ring
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About the Biohazard black outline icon
Three broad crescents radiate at even angles from a central double ring, their inner tips forming a three-pointed shape inside the circle — the internationally recognized biological hazard trefoil. It signals infectious material, contaminated waste and restricted lab areas. Use it on laboratory door signage, medical waste container labels, biosafety training slides, pandemic and infection control graphics, and hazmat or emergency response materials.
The composition is rotationally symmetric at 120 degrees, so it stays balanced in any orientation, and the open outlined crescents keep it lighter than the solid version for use on dense backgrounds. It sits alongside radiation, toxic and flammable hazard marks in the same warning set. For real-world signage the filled style is safer, as thin outlines lose impact at distance.
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.
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.
