From the Knit Picks Website:
This hat was inspired by a traditional pattern called “Tree of Life”. Every stitch was a prayer for my Aunt Shirley who is fighting cancer. The pattern in this variation stands for hope, love and strength. Keep it for yourself as a symbolism of life or make it for a friend and put your prayers into it.

Needles:
Size 11 (8mm): 16” circular
Size 11 (8mm): DPNs