This indicator is a mechanical tool that tells the user exactly what the market trend is at any time, based on the teachings of Legendary trader, Mr. William D. Gann. He called this tool the "Trendline Indicator", but it has popularly become known as the "Swing Chart" by present-day traders.

In October 1909, Richard Wyckoff watched Gann for 25 market days (the markets traded on Saturdays back then), where Gann made 286 trades, both long and short. Two hundred sixty-four (264) of these trades were profits. The Swing Chart was Gann's primary trading tool helping him achieve these phenomenal trading results.