According to below it ' s the swedish words for ' skatetopost ' or as we call it in North America , the reverse verticalhorizontal or RVH . <| sep |> Are you guys doing additive production with amorphous metals too ? Like with electron beam melting of fine powder and extreme cooling or such . I did some research on amorphous metals and found out that it appears to be possible , of course depending on the alloy ' s misfits and stuff in the microstructure . <| sep |> As to why the Chukonu and the like didn ' t make their way across the silk road ? It would have been a matter of national security . The Chinese were willing to put people to death for trying to smuggle out silk worms and paper for more than a thousand years . their prime military breakthrough we can guess would have been a bit harder to hide and a bit higher up the inspection chain when leaving the empire . Actually it was probably because it wasn ' t all that effective . Even the Chinese didn ' t use it all that much .