Moving Average Convergence-Divergence (MACD)
http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:moving_average_conve
http://www.investopedia.com/
MACD (moving average convergence/divergence) is a technical analysis indicator created by Gerald Appel in the late 1970s.[1] It is used to spot changes in the strength, direction, momentum, and duration of a trend in a stock’s price.
http://en.wikipedia.org/wiki/MACD
Moving Average Convergence Divergence – MACD
http://www.investopedia.com/terms/m/macd.asp#axzz27UG32gpA