Analogous to Bollinger bands but performs all computations on the logarithms of the values.
Unlike the regular bollinger bands (or most other variations of them available on tradingview), these won't annoy you by rescaling the chart when you try to look at the Bitcoin weekly chart or any other chart with strongly exponential behaviour, and the moving average is perfectly centered between the two bands on your log chart. The lower band is guarenteed to be positive for positive inputs.
For low-volatility charts, these will basically look identical to the regular BB's. However for clearly exponential charts where the values range over several orders of magnitude, this gives much better results, and it plays nicer with log plots. Hence I tend to just use these as my standard goto bollinger bands instead of the regular ones.