Tablet weavers often talk about threading directions and tablet directions (I prefer "warp alignment" rather than tablet directions) when describing patterns. Respectively, these terms refer to how the threads pass through the tablets and how the tablets appear when the warp is viewed from above. I generally use warp alignment as a / tablet will cause threads to lie / when turned forwards and \ when turned backwards. A \ threaded tablet will cause threads to lie \ when turned forwards and / when turned backwards.
All of the threading diagrams produced by Tablet Weaving Draft Designer show both threading direction (the letters at the bottom of the diagram) and warp alignment (the slant of the ovals in the diagram).
|An example threading diagram|
You can change the threading direction or warp alignment of a tablet by flipping it. If you find that you have a large amount of twist built up behind the tablets, you can use this technique to change their threading direction/ warp alignment, then continue weaving as before to weave out the twist.
The threading directions in the above diagram are shown by the letters and the warp alignments are shown by the slant of the tablets.
I've also recorded a video of how I flip a tablet to change its threading direction here: