Biohazard Trefoil Rings black outline icon
Biohazard trefoil made of three interlocking crescent rings around a center circle
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About the Biohazard Trefoil Rings black outline icon
Three interlocking crescent rings radiate from a shared center to form the biological hazard trefoil, the internationally recognized warning for infectious or contaminated material. Use it on laboratory signage, medical waste containers, safety training slides, pharmaceutical and clinical packaging, and hazard layers in facility maps or emergency response apps.
Each arc breaks where it passes behind the next, creating the woven look, and the three lobes sit at equal angles for a balanced, rotationally even mark. It works next to radiation, flammable and toxic icons; keep generous padding around it on a solid background.
This is the black outline version of the biohazard trefoil rings icon: even, monoline strokes that stay crisp at small sizes and suit clean, minimal interfaces, wireframes and light backgrounds.
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.
