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In technical analysis, a chart that does not account for volume or time. That is, a renko chart is a series of small bricks, each representing a change in price. When a price goes above or below a previous price, a new brick is added to the chart. A white brick represents an increase in price while a black brick represents a decline. A renko chart is useful because it can help technical analysts find support and resistance levels accurately.

A type of chart, developed by the Japanese, that is only concerned with price movement; time and volume are not included. It is thought to be named for the Japanese word for bricks, "renga". A renko chart is constructed by placing a brick in the next column once the price surpasses the top or bottom of the previous brick by a predefined amount. White bricks are used when the direction of the trend is up, while black bricks are used when the trend is down. This type of chart is very effective for traders to identify key support/resistance levels. Transaction signals are generated when the direction of the trend changes and the bricks alternate colors.

Source(s):

http://www.investopedia.com/terms/r/ renkochart.asp

Renko charts are similar to Three Line Break charts except that in a Renko chart, a line (or "brick" as they're called) is drawn in the direction of the prior move only if prices move by a minimum amount (i.e., the box size). The bricks are always equal in size. For example, in a 5-unit Renko chart, a 20-point rally is displayed as four, 5-unit tall Renko bricks.

Renko charts were first brought to the United States by Steven Nison when he published his book, Beyond Candlesticks.

Basic trend reversals are signaled with the emergence of a new red or blue brick. A new blue brick indicates the beginning of a new up-trend. A new red brick indicates the beginning of a new down-trend. Since the Renko chart is a trend following technique, there are times when Renko charts produce whipsaws, giving signals near the end of short-lived trends. However, the expectation with a trend following technique is that it allows you to ride the major portion of significant trends.

Since a Renko chart isolates the underlying price trend by filtering out the minor price changes, Renko charts can also be very helpful when determining support and resistance levels.

Source(s):

http://codebase.mql4.com/691

Renko charts are price charts with rising and falling diagonal lines of boxes that are either filled or hollow. Renko charts are "time independent" charts that do not have constantly spaced time axes.

A type of chart, developed by the Japanese, that is only concerned with price movement; time and volume are not included. It is thought to be named for the Japanese word for bricks, "renga". A renko chart is constructed by placing a brick in the next column once the price surpasses the top or bottom of the previous brick by a predefined amount. White bricks are used when the direction of the trend is up, while black bricks are used when the trend is down. This type of chart is very effective for traders to identify key support/resistance levels. Transaction signals are generated when the direction of the trend changes and the bricks alternate colors.

Investopedia explains Renko Chart

For example, a trader will sell an underlying asset when a black brick is placed at the end of series of climbing white bricks. Since this type of chart was designed as a way to follow the general price trend of an asset, there can often be false signals where the color of the bricks changes too early, producing a whip-saw effect.

Source(s):

http://www.investopedia.com