Tree rings are said to show how old a tree is. So showing tree rings that indicates an older tree, it could either depict you as an old soul or that you are strong enough to grow. But it could definitely depend on your own story.
Axe, Germany, "Let's talk about this. I am of German stock and can appreciate this although I would like to see a balance of a bit more head. A metal shaft goes well if balanced for throwing and deadly striking.