You are referring to a "hybrid" indicator

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RAVI (Range Action Verification Index) was invented by Tushar Chande and it's definition is rather simple (as described in Beyond Technical Analysis) :

RAVI = Absolute value (100 x (SMA(7)-SMA(65))/SMA(65))

where SMA stands for simple moving average. In trading terms, RAVI resembles to ADX, except that generaly, RAVI value greater than 3% is considered to be a strong trend while ADX has different values for that trend confirmation.

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The "fisher" part in the name could be Fisher transform or it could be inverse fisher transform, but my guess is that you refer to indicator that is an Inverse Fisher Transform of RAVI.

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One very good version of Inverse fisher transform of RAVI, made by Linuxser that does all these things, can be found in the elite section of TSD

regards
mladen