The rectangle is sometimes referred to as a channel or a consolidation. It is a very well known and easily recognized chart pattern that has been used by many successful traders over the years, including Nicolas Darvas who made over $2 million in the stock market using a variation of the rectangle he called a Darvas box. A rectangle is formed when the price action is contained within two lines. Both the top line and bottom line are close to horizontal and the two lines are parallel.