> > That is, I do not know, in English, the name of the crease that goes from > the centre of one edge to the centre of the opposite edge. And I do not > know the name of the cross made from two of those creases. I hope somebody > can clear up this terminology for me.
Hi Hans, In many cases the terms I have personally used for these folds are math terms: A *plus sign* (or an addition sign) for two perpendicular creases at the center that are parallel to the edge. An X or multiplication sign for the diagonal folds. Regards, Leyla