The Mean Oscillator shows the spread between the historical mean and the actual close price.
By using this indicator we are able to see if a particular market is trading above/below historical mean value.
The Mean value equals zero in the oscillator scale. Therefore, we can use this indicator to clearly identify 'Return to the Mean' moves.
Note: Tradingview limits the number of candles we can use in each time frame. It is possible that the mean value could miss old data. That is especially true for markets with a long history or when we calculate it for intraday time frames.