The 3 legged bird is a mythical creature from the Korean history, and also it is the emblem of Koguryeo, one of the 3 kingdoms of ancient Korea, and also the strongest. Also called Samjogo, this legendary bird represents the sun and has a very important role in their tradition and history.
I love this symbol because admire so much Korean culture and tradition, and I would like to have such a T-shirt, and why not, make others like it ^^