give some detail on the symbols associated with the book?
Three azure blue concentric circles on a white background that are "emblematic of the infinity, eternity, and universality of the Paradise Trinity."
The Urantia Book
An important symbol described in "The Urantia Book" as "the banner of Michael" and the "material emblem of the Trinity government of all creation," consists of three azure blue concentric circles on a white background. The circles are said to be "emblematic of the infinity, eternity, and universality of the Paradise Trinity." 
who is william s. sadler? He was an American surgeon, self-trained psychiatrist, and author. where did he get his surgeon degree? UNANSWERABLE is he alive? No, he died in 1969 did he write any books? Yes, "The Urantia Book" what's the book about? It introduced the word "Urantia" as the name of planet Earth - its intent is to "present enlarged concepts and advanced truth." what cosmological views does the book impart? That the center of the cosmos is the Isle of Paradise where God lives, and it is surrounded by "Havona". does the book have any copyright issues? In 1991 Kristen Maaherra was sued by the Urantia Foundation for violating their copyright on the book. was the book accused of plagiarism for using any other published material? No, but "Jesus–A New Revelation" included 76 of the 196 papers included in "The Urantia Book".
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The Urantia Book [SEP] Symbols
An important symbol described in "The Urantia Book" as "the banner of Michael" and the "material emblem of the Trinity government of all creation," consists of three azure blue concentric circles on a white background. The circles are said to be "emblematic of the infinity, eternity, and universality of the Paradise Trinity." The incarnated priest and contemporary of Abraham, Machiventa Melchizedek, wore on his breast an emblem of three concentric circles representative of the Paradise Trinity. During a system-wide rebellion instigated by Lucifer, the so-called "war in heaven," Lucifer's emblem was a banner of white with one red circle, in the center of which a black solid circle appeared.