It is the moving average of the RSI Buffer which is actually the RSI. I believe the stock period is 7 for the moving average and the RSI is 13. So you have a 7 period moving average of the RSI(13). In the code below (last line), it is called the MbBuf and is indicator #6 if you wanted to call it from an EA.
{
RSIBuf = (iRSI(NULL,0,RSI_Period,RSI_Price,i));
MA = 0;
for(int x=i; x<i+Volatility_Band; x++)
{
RSI[x-i] = RSIBuf[x];
MA += RSIBuf[x]/Volatility_Band;
}
UpZone = (MA + (1.618 * StDev(RSI,Volatility_Band)));
DnZone = (MA - (1.618 * StDev(RSI,Volatility_Band)));
MdZone = ((UpZone + DnZone)/2);
}
for (i=limit-1;i>=0;i--)
{
MaBuf = (iMAOnArray(RSIBuf,0,RSI_Price_Line,0,RSI_Price_Type,i));
MbBuf = (iMAOnArray(RSIBuf,0,Trade_Signal_Line,0,Trade_Signal_Type,i));