Average Directional Index (ADX)
An indicator used to measure the strength of a trend and indicate if it is trending or ranging. It has a range from 0-100 with 100 indicating a very strong trend. The value from 0-20 shows no sign of true trends, if the number is over 25 then the market is trending.
NOTE: This indicator does not help with finding the direction of a trend, it just identifies the strength of a trend.