Twisted stitch

Normally when you do knit stitch or purl stitch, when you loop the wool round, you put it outside the two needles, not between them. If you put the thread between them, this is a twisted stitch.

If you do stocking stitch, that is one row knit stitch, one row purl stitch. So you can have four options - that you twist the knit stitch, that you twist the purl stitch, that you twist both, or that you twist neither (which is conventional stotcking stitch).

The photo below shows all four. If you twist neither, it looks like little "v"s. If you twist one, one side of the "v" dominates. If you twist both, it definitely looks twisted!

It is even visible from the other side.

This is likely to be an error, but you can do it as an effect if you want!