The golden cross is a technical indicator that occurs when a stock's 50-day moving average crosses above its 200-day moving average. This is generally considered a bullish signal, suggesting that the stock's long-term trend may be changing. In the case of Banco Santander, the formation of a golden cross could lead to an increase in the stock's price in the short term. However, it is important to note that seasoned investors do not blindly trade based on golden crosses, but rather use them as a signal to start considering long positions based on other factors such as price levels and company fundamentals.