The Bullish Engulfing Signal indicator is designed to identify and highlight potential buying opportunities based on the well-known bullish engulfing candlestick pattern. This pattern occurs when a smaller red (bearish) candle is followed by a larger green (bullish) candle that completely engulfs the body of the previous red candle. The engulfing pattern suggests a potential reversal from a downtrend to an uptrend, making it a useful signal for traders looking to enter long positions.