What Could This Mean?
There's structurally very little difference between a tall regular stitch, a tall Tunisian stitch, and a return pass. This is especially obvious, like with Aquarienne, when there are several TYO mixed with tall stitches. In other words, when doing Tunisian filet lace.
Even without tall stitches and TYO, though, we still do regular crochet versions of Tunisian crochet. We just call it linked stitches. The big difference is that linked stitches lack names for parts!
Our linked stitches always seem to be made by pulling up a loop in what is called the horizontal bar or cross bar (the diagonal yarn-over strand of the tall stitch). Most people notice after awhile that it looks like Tunisian simple stitch (TSS) done sideways, and it is. In Tunisian crochet it's the front VB.
Thanks to Tunisian, we can see what happens in regular crochet if we link to some other strand(s) in the stitch stem: try Tunisian Knit Stitch, Purl Stitch, Reverse Stitch or Full Stitch sideways. It also means that we have names to use for those other strands of the stitch stem.
Tunisian Terms Aren't Perfect
Not every place in a Tunisian stitch has an established name. Only one or two of the three horizontal bars is consistently named, for example.
I don't know what it would be like to apply existing Tunisian terms to very tall stitches, like a Tunisian Double Treble (Tdtr, or in UK/AUS: Ttrtr).
A Tdtr has three initial yarn overs. It's the vertical equivalent of three TYO. The Tdtr has 3 sets of [3-strand bundle of 3 VB, 1 front horizontal bar] and then the final front and back VB at the top. I'm not sure of the clearest way to refer to a different strand of each bundle in the vertical stack.