Trend finder in chart

Hi there,
I had coded an AFL long back to find trend in a chart.
I had used following indicator as shown in the screenshot below.
I want to know what is it exactly. It will help me code it again if anybody knows what it is.
Sharing the chart I had long back.
Please let me know if anybody have some idea.
Thank you.

Try Chart->Bands->HiLo


Hi @awilson,
Thanks a lot buddy :blush: