"Assault Knives"

Nobody seems to know if this is real or parody; I've seen it cited on both kinds of pages lately. 

As a longtime student of the Riddle of Steel, I have to admit that I don't know what an 'assault knife' might be. It's apparently twice as dangerous as a Rambo knife, though! 

I do recall that the UK went through a thing about "Zombie-style knives" a while ago, which apparently is defined in law as 'the kind of knives you see in Zombie movies.' I assume some equally precise definition is at work here.