Unlike images of icons, the icon font is fully customizable with CSS. Therefore, different themes can be applied.
SAP Icon Font
The icons are essentially vector graphics. They can be resized easily without compromising their appearance. Using custom unicode character mapping, the SAP icon font is also regularly reviewed and updated to meet the standards of SAP Fiori apps. And naturally, the icon font is compatible with all browsers and platforms.
Want to dive deeper? Follow the links below to find out more about related controls, the SAPUI5 implementation, and the visual design.