Radioactive black filled icon

About the Radioactive black filled icon

The international trefoil: three tapered blades set at even intervals around a small central circle, each separated by a clear gap. It marks radiation sources, nuclear material and restricted zones. Use it on hazard labels and signage, laboratory and medical imaging interfaces, energy sector reports, safety training slides, and game or sci-fi interface art.

Blades fan out at 120 degree intervals with an open ring left around the core, so the shape stays recognizable when reduced. Pair it with biohazard, flammable and high voltage warning icons; set it inside a triangle or circle when a formal warning sign is required.

This is the solid black filled version of the radioactive icon: a bold silhouette that reads clearly at 16-24 px and on dark or busy backgrounds, and prints well in one colour.

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.