NR4 (Narrow Range 4) is a price action indicator used in trading to identify potential breakouts. It occurs when the range of the current day's price (high minus low) is narrower than the previous three days' ranges. Traders often use NR4 to spot consolidation periods and anticipate price movements, leveraging the breakout for entry points. https://www.definedgesecurities.com/library/nr4-line-break/