Using icons 

Rendering via Fluid 

The <core:icon /> ViewHelper, provided by EXT:core system extension, can be used to render icons in Fluid.

Just make sure that the corresponding namespace is loaded in the template and pass the icon identifier (e.g. retrieved from a database field).

<html
    xmlns:f="http://typo3.org/ns/TYPO3/CMS/Fluid/ViewHelpers"
    xmlns:core="http://typo3.org/ns/TYPO3/CMS/Core/ViewHelpers"
    data-namespace-typo3-fluid="true"
>
<core:icon identifier="{data.icon}" />
</html>
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