Overlays higher timeframe high and low over the current bars - pictured is daily high and low overlayed on lower timeframe chart.
Can be set to fill between the open and close to show higher timeframe candles by color, with bullish or bearish fills
Very versatile and can be used to display weekly or monthly opens, or used to display previous weekly highs and lows for charting out possible liquidity points, etc.
Originally converted from Chris Moody's HLOC pine version 2 indicator.