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.
"I created this PDF guide and short video to go over a few Sacred Geometry symbols, their names and meanings - learn more and how to create your own Sacred Geometry artwork (click the image to watch)." By Skybox Creative