code: def set_qemu_symbol(self):
          
          valid_devices = {'ASA': 'asa', 'PIX': 'PIX_firewall',
                           'JUNOS': 'router', 'IDS': 'ids'}
          if self.device_info['from'] in valid_devices \
                  and 'default_symbol' not in self.node \
                  and 'hover_symbol' not in self.node:
              self.set_symbol(valid_devices[self.device_info['from']])
docs: Set the appropriate symbol for QEMU Devices