Biohazard black filled icon

About the Biohazard black filled 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 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.

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.