Heroicons is a set of 292 beautifully crafted open-source icons for web design, web apps, and other projects. The icons come in four styles—Outline, Solid, Mini, and Micro—and are available in SVG format at different pixel sizes for each style. Outline icons have a 1.5px stroke width, while Solid icons are solid shapes. Mini and Micro icons are smaller versions of the Outline and Solid styles.

The icons cover various categories, such as navigation, UI, objects, symbols, and more. Some examples include arrows, buttons, checks, currency symbols, devices, maps, media controls, statuses, and users. All icons are designed to be functional yet pretty and have a consistent design aesthetic.