It's important that everyone understands, and hopefully uses, the same terminology to describe the way the tablets are warped.
I think labeling the corners in any way is an abomination – that ABCD stuff you see in most books and patterns. It's confusing, and everyone does it differently. It's one of the biggest sources of confusion for new weavers.
Instead, the corners of a tablet can be labeled unambiguously according to warp end, cloth end (just like loom weaving), and face and back of the band – two planes is enough to label all four corners.
All diagrams in this talk are in that same orientation.