The "9-day EMA" refers to the 9-day Exponential Moving Average, a technical analysis tool used in financial markets. It calculates the average price of a security over the last nine days, giving more weight to recent prices. This makes it more responsive to price changes compared to a simple moving average. Traders often use the 9-day EMA to identify trends and potential buy or sell signals. When the price crosses above the 9-day EMA, it may indicate a bullish trend, while a cross below could suggest a bearish trend. This tool is commonly applied in conjunction with other indicators for better decision-making.