In the Document Editor, Spreadsheet Editor, Presentation Editor, and PDF Editor, you can insert and customize thousands of vector icons using the Icons plugin. The plugin is based on the Font Awesome library. Please refer to the GitHub page of the plugin to learn more.
ImportantStarting with ONLYOFFICE Docs 8.2, no plugins come with the editors by default. The plugins shall be installed via the Plugin Manager.
Once an icon is inserted, you can customize it using the Shape settings menu on the right-side panel: