The koru a symbol frequently seen in Maori art, and is generally agreed that it is inspired by an unfurling silver fern frond. The spiral suggests a return to the point of origin or the center, evokes the idea of perpetual movement, and can be symbolic of new life and the way in which life both changes and stays the same.
I encourage you to learn more about the Maori culture, including the symbol of the Koru by visiting this page and associated resources.
To me, it also serves as a reminder to reflect on all that is good and peaceful in the world - a visual cue that takes me to a place where I am surrounded by a lush, dark, cool forest environment with nothing between me and the world but my thoughts.
The spiral reminds me of the excitement and energy that forging a new path can bring, and also of the safety and comfort from returning to your center and your beginnings.