This is an adaptive moving average based on a signal noise ratio. It's inspiration is frm Eugene Durenard's book Professional Automated Trading Theory and Practice. Shout out to CryptoStatistical for his implemenation of Durenard's concepts that became the basis for this script.
Check out my breakout strategy based on this concept here.
@mrgr888n, it is like period or length for an MA, the script will adapt between the min and max to make the line more or less responsive based on whether price is trending or not.