Sigma

The sigma icon represents the Greek letter sigma, often used in mathematics and science to denote summation or standard deviation. This icon is typically used to indicate a mathematical operation or concept.

In software like MATLAB, Mathematica, or scientific calculators, the sigma icon is used to represent summation or standard deviation in mathematical expressions.

From a UX perspective, the sigma icon communicates a mathematical concept or operation. It helps users understand that a calculation or formula is being applied.

Sigma is one of 9,161 icons in Phosphor, made by Phosphor Icons and released under MIT. It is drawn on a 256 × 256 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 SigmaIcon to components/icons/ph-sigma.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 SigmaIcon 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.

Yes, if your project has @phosphor-icons/react: Sigma is `Sigma` there, used as <Sigma />. The shadcn.io MCP server answers with that import when it finds the package. Without it, copy the icon from here.

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 Sigma icon, or any of 9,161 Phosphor icons, and install it from a prompt.

It's drawn in currentColor, so it takes the text color wherever you use it: a class like text-primary recolors it. To bake a color in, set one in Customize before you copy.

Set width and height on the component, or a class like size-6. It's drawn on a 256 × 256 grid, so it stays sharp at any size. Customize also sets the size it exports at, its padding and rotation.

Yes. It follows the text color, so with text-foreground (or any theme token) it changes with your light and dark themes. 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="Sigma", so screen readers say what it does.

Yes. SigmaIcon passes every SVG prop to the svg element, so <SigmaIcon 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. MIT allows commercial use; keep the license notice when you ship the icons' source files. The full terms are in the license, linked on this page.

No visible credit is required: MIT only asks that you keep the license notice if you ship the icons' source files. Icons installed with the shadcn CLI already start with a comment naming Phosphor, Phosphor Icons and the license.

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

8 other libraries draw an icon called Sigma. 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 education, science, engineering, math, mathematics and physics. Each tag page lists the icons that carry it from every library, which is the quickest way to find a match for Sigma in another set.

Phosphor draws many icons in several styles: Bold, Light, Thin, Duotone and Fill next to the default. Open the library and pick a style above the grid to see Sigma's siblings in it.