Awesome icons
Antora support the use of a rich icon set (here thanks to font-awesome project). Your can find all the details here : https://docs.asciidoctor.org/asciidoc/latest/macros/icon-macro/
You can explore the free icons here : https://fontawesome.com/search?o=r&m=free
Anatomy
The icon macro is an inline macro. Like other inline macros, its syntax follows the familiar pattern of the macro name and target separated by a colon followed by an attribute list enclosed in square brackets.
icon:<target>[<attrlist>]The <target> is the icon name or path. The <attrlist> specifies various named attributes to configure how the icon is displayed.