Stelae of Doctors
Turtle Steles with the names of those successful at the royal exams

In 1484, the King Lê Thánh Tông erected 116 steles of carved blue stone turtles with elaborate motifs to honour talent and encourage study. The turtle ("quy") is one of the nation's four holy creatures. The others are the dragon ("long"), the unicorn ("ly") and the phoenix ("phuong"). The turtle is a symbol of longevity. The shape and size of the turtle changed with the passage of time.

The doctors' steles are a valuable historical resource for the study of culture, education and sculpture in Vietnam. 82 stelae remain. They depict the names and birth places of 1307 graduates of 82 triennial royal exams. Between 1442 and 1779, eighty-one exams were held by the Le dynasty and one was held by the Mac dynasty.[4] The ancient Chinese engravings on each stele praise the merits of the monarch and cite the reason for holding royal exams. They also record the mandarins who were tasked with organising the exams.
http://en.wikipedia.org/wiki/Temple_of_Literature,_Hanoi#First_Courtyard