PendingOrder.SymbolName

string SymbolName {get;}

pendingOrder.SymbolName: str

var eurUsdOrders = PendingOrders.Where(order => order.SymbolName == "EURUSD").ToArray();
Print("EURUSD pending orders: {0}", eurUsdOrders.Length);

eurUsdOrders = [order for order in api.PendingOrders if order.SymbolName == "EURUSD"]
api.Print(f"EURUSD pending orders: {len(eurUsdOrders)}")