def METHOD_NAME(self, signal_symbol) -> SignalConnector:
    """Get or create signal connector."""
    for sc in self.signal_connectors:
        if sc.symbol == signal_symbol:
            signal_connector = sc
            break
    else:
        signal_connector = SignalConnector(signal_symbol)
        if self.initialized:
            self._init_sc(signal_connector)
        self.signal_connectors.append(signal_connector)
    return signal_connector