This indicator represents an implementation of the Parkinson's historical volatility of a financial asset. It is very similar to the Average True Range technical indicator.
This indicator was first implemented in MQL4 and published in Code Base at mql4.com 23.09.2010.
Fig.1 The ParkinsonHistVolatility Indicator
Translated from Russian by MetaQuotes Software Corp.
Original code: https://www.mql5.com/ru/code/1060
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.