When I fold corner to corner I make a diagonal fold and I have created a diagonal crease. When instructing I can tell them to fold corners to corners, or to make the diagonals.
When I fold side to side I make a book fold and I have created a ... what? When instructing I can tell them to fold sides to sides, or to make the ... what? Certainly not the books :-) When making each of these steps, I get the diagonal cross and the ... what ... cross? In Danish I call them “diagonalfolder” and “tværfolder”, where “tværs” means across, and I get a “diagonalkryds” and a “tværkryds” where “kryds” means cross. 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. Best regards, Hans Hans Dybkjær papirfoldning.dk Society: foldning.dk