The Chaikin oscillator is named for its creator Marc Chaikin.
The basic premise of the Accumulation/Distribution Line is that the degree of buying or selling pressure can be determined by the location of the close, relative to the high and low for the corresponding period.
There is buying pressure when a stock closes in the upper half of a period's range and there is selling pressure when a stock closes in the lower half of the period's trading range.
Calculate the accumulation-distribution line (ADL) in three steps. The fourth step yields the Chaikin Oscillator.