What Does The Endpaper Chart With Symbols Connected With Lines Mean?

There were 10 orders of Knights Radiant. The powers of each order were based on manipulating two of the surges, the smaller magic systems on Roshar. They combine two surges, then add something thing of their own based on how the surges interact. So if you look at the chart on the endpapers, you can find a large circle connected to two smaller circles. Each of those sets represents on order of the Knights Radiant.