A charting pattern used in technical analysis. It describes the drop of a stock (or index), a rebound, another drop to the same (or similar) level as the original drop, and finally another rebound. The double bottom looks like the letter "W". The twice touched low is considered a support level. Most technical analysts believe that the advance off of the first bottom should be 10-20%. The second bottom should form within 3-4% of the previous low, and volume on the ensuing advance should increase.