大方廣佛華嚴經疏 48.15

48.15

Thirteenth, the hands have thirteen marks, divided into three: the first nine directly describe marks of the hands. That there are five on the right and four on the left is either because one is missing on the left, or to symbolize that the right is used frequently. Yet for the shoulders above, there were two on the right and three on the left, so overall the marks are exactly equal. In the right, number sixty-six says "forming a net of transformations": the light transforms into a net. In the left, number seventy-two says "adorned with Indra's net": this is the mark of webbed fingers, because they mutually interpenetrate. The next two are the left and right fingers, which are self-evident. The last two, both left and right palms possessing thousand-[spoked] wheels: the three components of wheel hub, spokes, and rim are fully complete, naturally accomplished without awaiting human effort.