A "Death Cross" is a technical analysis term used in stock market trading. It refers to a bearish trend reversal pattern that occurs when a stock's short-term moving average (such as the 50-day moving average) crosses below its long-term moving average (such as the 200-day moving average). This crossover is considered a bearish signal, indicating that the stock may experience downward momentum in the near future. Some traders interpret this pattern as a sell signal and adjust their portfolios accordingly. However, it's important to note that death crosses are just one of many technical indicators and should not be the sole basis for investment decisions.