code: public function iconGetName($key)
      {
          $iconid = ($this[$key] < 0) ? (pow(2, 32)) - ($this[$key] * -1) : $this[$key];
  
          return new StringHelper("/icon_" . $iconid);
      }
docs: Returns the internal path of the node icon.
  
  @param  string $key
  @return StringHelper