Fish (weapon)
From AmtWiki
Fish was the name of about a 12' Polearm made by Satori. It was so named because the striking area bore some passing resemblance to a Fish.
It was probably illegal, as Satori found the PVC shaft wasn't strong enough to stay straight and would bend considerably when held horizontally. He solved this probably by placing a large copper rod inside the PVC core. Despite this obvious illegal quality, it was more or less allowed due to the superb nature of the foam he used on the striking surface, being extremely soft and cushiony. In fact, its more common usage was as a pillow in Nirvana.