I don't know where are you in folding this CP, so I assume you are starting.
That's a detailed precrease sequence:
- Square with book and diagonal folds; make the bisectors, and mark only the edges.
- Connect the near marks and fold these triangles inside. You now have a regular octagon.
- Connect these marks with horizontal, vertical and 45' creases.
- Crease the waterbomb bases on the left, right and bottom.
- Crease the sawhorse on the top-center.
- Sink those in and out in 4th.
- Now connect all the outermost sink creases into a hollow cross.
Now you have to collapse starting by those sunk waterbombs/sawhorse, ignoring the corner triangles.
I've heard this terminology at conventions. There are also such strange names like "ice cone fold" and other funny descriptions.
The book fold is when you have a square and fold it in half horizontally. Now you can open and close it like a book, hence the name. So what you have to do in the first step is to take a square and fold it in half all four ways (2x edge to edge, 2x corner to corner).
These are old terms that pre-date full acceptance of the Yoshizawa-Randlett standards that are used for diagramming. The "ice cone fold" was an ice cream cone fold, I believe, which is similar to a simple kite base ... because it looks like an ice cream cone.
Now imagine trying to explain an Elias stretch to someone.....
Exactly! One my colleague using name "ice-cream" (this is of course translation, he use Czech word ) for that shape. And children love it! And remember it.
Made from square sheet of masking paper around 17.
Since it based on a 34 grid I opted to create a grid of 36 and cut off two row verticaly and horizontaly. I actually messed up on this and ended up with a lot of extra diagonal creases...