K is for Knuckle Bow
Competitive sabres have them and many rapiers did. Not only great for protecting the hand but great for in-fighting also – smashing into the face especially. The pommel is great for that also as is the cross guard. You can also (as a neat trick) reverse your sword, holding the blade with both hands, one hand on the foible and one on the forte. Then use the parts of the hilt and grip as a weapon. Nasty stuff. Not taught on the lawns of the great families but in the dark alleys where the smell of brandy and whiskey is strong. That and urine. I had to add that in. Couldn’t help myself.