The real author:
Richard Dawood Donchyan
Donchian Channel is a volatility indicator based on the calculation of the current price range with the recent highest and lowest prices.
Code is similar to Donchian Channels, but the middle line is not plotted.
Donchian Channel indicator
The Acceleration/Deceleration Indicator (AC) measures acceleration and deceleration of the current driving force.Average Directional Movement Index (ADX)
The Average Directional Movement Index Indicator (ADX) helps to determine if there is a price trend.