Just a double Bollinger band indicator used in The Little Book of Currency Trading by Kathy Lien
Please see explanations how to use it
http://www.investopedia.com/articles/fo ... z1VmdUeyAw
This indicator is equal to putting just two BB indicators on the same chart, but is a little bit less resource eating and can highlight the zone between inner and outer bands for easier interpretation
Download:
Double Bollinger Band
Triple Bollinger Bands
Dec 10, 2015: Compatibility issue Fix. _Alert helper is not longer needed.
The indicator was revised and updated
MT4/MQ4 version
viewtopic.php?f=38&t=64446