The Laguerre RSI Indicator is a modification of the well-known relative strength indicator or RSI. John F. Ehlers, the famous trader who created the Laguerre RSI, tried to avoid whipsaws (noise) and lag produced by smoothing technical indicators by applying a filter and some changes to the original relative strength indicator. The result is a technical indicator that is more responsive and has much less noise than the original RSI indicator.
The multi-time frame LRSI is used to have multiple RSI oscillators on the screen at once that are derived from different intervals. This allows the trader to see setups in multiple time frames.