Check out the list of all built-in icons here. If you want to add an icon into your content, use the shortcode (LSVR Elements plugin is required for this shortcode to work). More icons can be added via 3rd party plugins.
Search: icons
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The easiest way to do it is to install one of many 3rd party plugins for that.
This shortcode displays a simple icon. iconIcon to display. Check out the list of icons. idUnique ID which can be used for applying custom CSS to this element.