What the Heck is a BlackJack?
In episode 103 which you can listen to here, Matt described a weapon that one of the thugs used to attack Daredevil as a blackjack. There was some confusion as to what a blackjack is. A blackjack is a small leather billy club that is weighted at the end of intended impact. Used correctly is should render the attackee unconscious. This is called “braining” and causes a cerebrum concussion. As this is a simple tool crafted for underhandedness, it’s been used throughout history by muggers, thieves, and highwaymen.
Here is a link to some fool reviewing blackjacks as weapons: