Being an old Ki Society guy, I thought that would be obvious to you. In my recollection, there was a happo undo drill in Shin Shin Toitsu Aikido. The eight directions are all on the horizontal plane and they rotate around as in a compass 45 degrees apart. The undo can be done with bokken as in happo giri or without weapons as in happo ikkyo.
Just saw that Graham answered before me - mental note: read all remaining posts before posting