Here's why they're called "unlike":
* Opposite Attract: Unlike poles of magnets attract each other. So a north pole will be drawn towards a south pole.
* Same Repel: Like poles of magnets repel each other. So a north pole will push away another north pole, and a south pole will push away another south pole.
This fundamental principle of magnetism is what makes magnets so useful for things like compasses and holding objects together.