Meaning of A-D in English

A-D

Advance-Decline, or measurement of the number of issues trading above their previous closing prices less the number trading below their previous closing prices over a particular period. As a technical measure of market breadth, the steepness of the A-D line indicates whether a strong bull or bear market is under way.

Campbell R. Harvey. Hypertextual finance English glossary.      Английский словарь гипертекстовых финансов.