The indicator marks the last fractal highs and lows (W,D,4H and 1H options) to help determine current market structure. The script was created to help with directional bias but also as a MTF visual aid for stop hunts/liquidity raids.
Liquidity areas are where we assume trader's stop losses would be when buying or selling. Liquidity lies above and below swing points and institutions need liquidity to fill large orders.
Monitor price action as it hits these areas for a potential reversal trade.