This article is from the Glossary of Technical Analysis Terms.
The Gann Square is a mathematical system for finding support and resistance based upon a commodity or stock's extreme low or high price for a given period. Attainment of a particular price level in a square tells you the next probable price peak or valley of future movement. The probable price levels tend to be more reliable if they are extrapolated from Gann Square values along one of the major axes of the Gann Square. The Gann Square is generated from a central value, normally a all-time or cyclical high or low. If a low is used, the numbers are incremented by a constant amount to generate the Gann Square. If a high is used, the numbers are decremented during the square generation.