From Mladen Rakic:

In his article in January 2022 issue of TASC, “(Yet Another) Improved RSI,” John Ehlers explains how he enhances the RSI by taking advantage of Hann windowing. The RSIH indicator provides a smoother calculation than the classic RSI and has a zero mean. The inherent smoothing in the computation removes the need for supplemental filtering.

Compared to built in Rsi Bottom snapshot

Recommendations:
* You can use it as any other Rsi indicator
* You can use (since rsi is a momentum family of indicators) the color change for possible momentum change estimation
* You can use zero crosses as an estimation of longer term "trends"