NRTR (Nick Rypock Trailing Reverse).
There are a lot of modifications of this indicator for mt3 and mt4 as well. But original idea came from here - see image attached. It was the good trading system in 2001.
Name of this indicator is Caterpillar.
caterpillar.mq4 is going to the indicator's folder as usual and
ExpertSample.dll in the librarues folder (experts/libraries).
There is website in Russian and they are selling some software. And people created...