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Explanation of the Script

Bullish and Bearish Candles: The function isBullishOrderBlock() checks if a candle is "bullish" in nature (based on body size to range ratio). Similarly, isBearishOrderBlock() checks for bearish candles.

Order Block Length and Threshold: length is the number of bars to scan for an order block, and threshold sets how strong a candle needs to be to be considered an order block.

Detection: The loop searches backward through the bars to find strong bullish and bearish order blocks, marking the price points where the strong moves happened.

Plotting: The plotshape() function is used to plot arrows or labels on the chart to mark where bullish or bearish order blocks are identified.

Improving and Customizing

Highlighting Blocks: Instead of just marking a point, you can plot horizontal boxes or shaded regions using box.new() to visually highlight the order block zone.

Use of Different Timeframes: You can modify the script to look for order blocks across multiple timeframes to increase accuracy.

Complex Rules: Depending on your strategy, you may want to add additional rules, such as looking for price to return to the order block area before confirming the strength of the block.