The Percentile indicator calculates dynamic percentile values of recent price data, providing a distribution-based alternative to traditional moving averages. It sorts the last N bars of price data and selects the value at a specified percentile, allowing users to analyze market behavior beyond linear smoothing methods. Key features include:

- Flexible percentile input (0–100), enabling selection from median (50) for central tendency, quartiles (25/75) for volatility envelopes, or extremes near 0/100 to capture distribution tails.
- An adaptive circular buffer efficiently stores recent prices for accurate, lag-free percentile calculations.
- A change tolerance filter reduces redundant recalculations when price changes are minimal, enhancing performance and chart clarity.
- Customizable lookback period to suit various trading styles, from intraday scalping to longer-term swing trading.

The indicator supports any price source (close, open, high, low, or custom inputs) and can be extended into percentile bands (e.g., 25th–75th range) to identify dynamic support and resistance zones. It offers a non-linear smoothing method that adapts to market distributions and reduces the impact of outliers compared to simple or exponential moving averages. The implementation is lightweight and optimized for efficient performance, best used with moderate window lengths of 20 to 100 bars.