This article is from the Glossary of Technical Analysis Terms.
Like Candlestick and Renko charts, Kagi charts come from Japan and were made popular in the USA by Steve Nison. Kagi charts display a series of connecting vertical lines where the thickness and direction of the lines are dependent on the price action. If closing prices continue to move in the direction of the prior vertical Kagi line, then that line is extended. However, if the closing price reverses by a pre-determined "reversal" amount, a new Kagi line is drawn in the next column in the opposite direction. An interesting aspect of the Kagi chart is that when closing prices penetrate the prior column's high or low, the thickness of the Kagi line changes.