Warhammer
"It takes the form of a rubberised, soft-touch black device shaped like a letter T – or a hammerhead shark, if, like the inventors you're feeling whimsical"
Pedantic I know, but I didn't see the inventors compare it to a (hammerhead) shark at all - I think that was *your* whimsical inference. They just call it a hammerhead, i.e. a shape which is just like - well, you know, the T-shaped head of a hammer. It could just as well be compared to any of the other hundreds of objects similarly-named for their hammerhead shape, all of which have temporaily escaped my mind at this current time.