Okay kiddo, so a Norwegian battle axe is a type of weapon that people in Norway used a long time ago to fight in battles. It's like a really big and strong axe that can be used to cut down trees and also to hit other people in battle.
The head of the axe is usually made of metal and has a sharp edge for cutting. The handle is made of wood and is usually pretty long so you can swing it with a lot of force.
The people who used these axes were very strong and skilled at fighting. They would swing the axe at their enemies to try to hit them and knock them down. Sometimes they would use the pointy end of the axe to stab people, too.
Nowadays, people don't use Norwegian battle axes for fighting anymore. Instead, they're seen more as a cool artifact from history. Some people even collect them as a hobby!