Yeah not one I've seen before either, from what little I read DVI is similar to a stochastic indicator for being oversold or overbought, but with a bit of trading strategy thrown into to it with longs and shorts?
Found a little tidbit, still about as clear a mud.
"The DVI is an intermediate oscillator which is a subset of the DVIO (like DVO, it is a flexible and adaptive indicator). There are several complementary components to the DVI, that aid in identifying intermediate overbought and oversold opportunities."
(20min delay)