Bollinger bands. Here is good place to start. Take a look at chart I posted. Then check the links out. http://stockcharts.com/school/doku.php?id=chart_school:technical_indicators:bollinger_bands http://stockcharts.com/school/doku.php?id=chart_school http://www.investopedia.com/terms/b/bollingerbands.asp Heres another good link. http://www.bollingerbands.com/