So, you know how knights used to wear armor and fight with swords? Well, one type of weapon they used was called a bec de corbin.
It looks like a long stick with a big pointy end, like a spear. But at the other end, it has something that looks like a hammer with a pointy thing sticking out of it. Imagine if a hammer and a spear had a baby - that's what a bec de corbin looks like.
The pointy end was used for stabbing the enemy, while the hammer-end was used for smashing and crushing their armor. It was a really powerful weapon that could do a lot of damage in a battle.
But don't worry, they don't use bec de corbins anymore since we don't do battles like that anymore. It's just a really cool weapon that you can learn about in history books.