Open Source Icon Sets

Material design icons is the icon set from Google, which follows the material design guidelines. These system icons are simple, modern and also delightful and beautifully crafted symbols that depict universal actions, items and concepts used commonly throughout a UI. All icons are available in a range of sizes, densities and themes, and have been optimized for beautiful display on all common platforms and display resolutions. The full set of icons can be viewed in the Material Icons Library, and are available in several formats and suitable for different types of projects. Developers can use them in their digital products for Android, iOS, and web; and designers in their mockups or prototypes.