Biohazard

The biohazard icon represents a symbol used to indicate the presence of biological hazards. It is often associated with danger, warning, and risk.

The biohazard symbol is widely used in laboratories, medical facilities, and other environments where biological hazards are present.

In digital design, the biohazard icon can be used in various contexts, such as medical websites, safety apps, or emergency response platforms.

Biohazard is one of 4,169 icons in Twitter Emoji, made by Twitter and released under CC BY 4.0. It is drawn on a 36 × 36 grid.

Sign in (it's free), then open Get icon, Install with shadcn CLI, and pick your package manager to copy the command. It adds BiohazardIcon to components/icons/twemoji-biohazard.tsx: one file, a size prop (24 by default) and every SVG prop, with no icon package.

Copy it as React (from Get icon, or the Code section): a typed BiohazardIcon component you paste into your project, with no package to install. Only the icons you import reach your bundle. It works in Next.js and any React app.

Open Get icon, then Copy as code, and pick Vue, Svelte, Angular, Solid or Preact; the Code section shows each one too. Every version is one self-contained component with the SVG inside, and SVG and data URL copies are there for plain HTML and CSS.

With Pro, the shadcn.io MCP server lets Claude Code, Cursor or any MCP client find the Biohazard icon, or any of 4,169 Twitter Emoji icons, and install it from a prompt.

It's multicolor, so it keeps its own colors.

Set width and height on the component, or a class like size-6. It's drawn on a 36 × 36 grid, so it stays sharp at any size. Customize also sets the size it exports at, its padding and rotation.

Yes. It keeps its own colors in light and dark mode, so check it against both backgrounds. The icon is a vector, so it needs no separate dark asset.

Next to a visible label it's decoration: add aria-hidden="true" so screen readers skip it. Standing alone, as in an icon button, give the button a name instead, like aria-label="Biohazard", so screen readers say what it does.

Yes. BiohazardIcon passes every SVG prop to the svg element, so <BiohazardIcon aria-hidden="true" /> works, and so do role="img" with aria-label, or a title child, when it carries meaning on its own.

Yes. Open Get icon, then Download file: SVG for code or design tools like Figma; PNG, WebP or JPEG at 512px; or an ICO favicon with 16, 32 and 48px inside. Each one uses what you set in Customize.

Yes, with credit: CC BY 4.0 asks you to credit the author (Twitter) where you use the icons. The full terms are in the license, linked on this page.

Yes. CC BY 4.0 asks you to credit the author where you use the icons, for example "Icons by Twitter, CC BY 4.0" on an about or credits page.

Yes. Copying and downloading it is free, and the shadcn CLI install only needs a free account.

8 other libraries draw an icon called Biohazard. The Other libraries section on this page shows each one, so you can compare them and open the one that fits your style.

Its tags are health, warning, safety, danger, risk and hazard. Each tag page lists the icons that carry it from every library, which is the quickest way to find a match for Biohazard in another set.

Twitter Emoji draws many icons in several styles: Light next to the default. Open the library and pick a style above the grid to see Biohazard's siblings in it.