Divi’s has built-in icons (in the Elegant Themes font) which you can add anywhere on your website such as menus, and content areas.
Source: https://intercom.help/elegantthemes/en/articles/2791864-adding-divi-icons-anywhere-you-want
Each icon has a unique code (reference) that can be added to text in a <span> like this:
This is text <span class='et-pb-icon'></span> and this is more text.
Code language: HTML, XML (xml)
You can style the icon inline like this:
This is text <span class='et-pb-icon' style='font-size: 1em; color: red;'></span> and this is more text.
Code language: HTML, XML (xml)