<?php
// call_user_func( function()
// {
  
// } );

use TYPO3\CMS\Core\Utility\GeneralUtility;

$iconRegistry = GeneralUtility::makeInstance(\TYPO3\CMS\Core\Imaging\IconRegistry::class);

$iconRegistry->registerIcon('begriffe_list_record_icon', \TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider::class, ['source' => 'EXT:begriffmgt/Resources/Public/Icons/book.png']);