code: public function getBackendIconImageTag(
          $icon,
          $alt = '',
          $attributes = '',
          $defaultIcon = 'bundles/metamodelscore/images/icons/metamodels.png'
      ) {
          return $this->image->getHtml($this->getBackendIcon($icon, $defaultIcon), $alt, $attributes);
      }
docs: Get a 16x16 pixel resized icon <img>-tag of the passed image if it exists, return the default MM icon otherwise.
  
  @param string $icon        The image path.
  @param string $alt         An optional alt attribute.
  @param string $attributes  A string of other attributes.
  @param string $defaultIcon The default icon.
  
  @return string