Accumulation (A) of positions generally occurs during the Asian session. The accumulation is characterized by being a consolidation.
Manipulation (M) usually occurs at the opening of the London session (sometimes at the NY open). It consists of taking the price to the opposite side of the true directional Expansion of the rest of the day.
Distribution (D) occurs when Market Makers liquidate (exit) their positions.
This AMD-Principle is represented in every bar of every time-frame (monthly, weekly, daily, 4 Hour, etc.) with a price value at which it starts trading (opening price), the highest price value (high), the lowest (low), and a value of the time it ends trading (close). The AMD-Principle can be observed in all financial markets - Forex, stocks, indices, commodities, bonds, etc.
WadeFX (2021) - Market Structure & Powerful Setups [151 p.]
ICT Forex - Accumulation - Manipulation - Distribution, Dec 09, 2017.