Whatever you want to call it! I hunted and hunted for an image of circles with center points and intersecting lines and finally borrowed my husband's compass and a ruler from my kiddos and drew one out. Maybe someone else here will find it useful? I'm also including several "decorative" elements that you might use for snowflakes, flowers, and other decor.
I recommend loading the original image in a layer as well as the stencil to help keep your center point. And plan to do a lot of rotating!