Quote from Sarasota:
It refers to a "grid" of support and resistance lines calculated using Gann's Square of Nine. Many charting packages have this tool, but quite frankly, the math used to calculate these squares is INCORRECT. For example, in most charting packages that have this tool, a 45 degree line (or a 1 x 1 line) is a diagonal that rises one unit in price for every unit in time. Makes sense, right?..... but it is wrong. This is NOT the way Gann traded. Too confusing to discuss here in addition to my desire to keep it secret.