Reason

The reason icon represents the Reason programming language, a functional programming language developed by Facebook. It's used for building scalable and maintainable software systems.

The reason icon appears in software development tools and platforms, such as IDEs, code editors, and documentation websites. For example, it may be used in Facebook's development tools or ReasonML documentation.

From a UX perspective, the reason icon communicates a sense of logical and methodical approach to software development. It helps users understand that the associated functionality or tool is related to programming and coding.

Reason is one of 1,136 icons in Material Icon Theme, made by Material Extensions and released under MIT. It is drawn on a 32 × 32 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 ReasonIcon to components/icons/material-icon-theme-reason.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 ReasonIcon 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 Reason icon, or any of 1,136 Material Icon Theme 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 32 × 32 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="Reason", so screen readers say what it does.

Yes. ReasonIcon passes every SVG prop to the svg element, so <ReasonIcon 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 Material Icon Theme, Material Extensions and the license.

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

3 other libraries draw an icon called Reason. 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 programming, code, AI, logic, functional and algorithm. Each tag page lists the icons that carry it from every library, which is the quickest way to find a match for Reason in another set.