What is what are urim and thummim in the alchemist?

Urim and Thummim are mentioned in Paulo Coelho's novel "The Alchemist" as a pair of stones or objects that give the wearer the ability to receive divine guidance and direction. The exact nature of these objects is not precisely described in the novel, but they are said to have been used in ancient times by Jewish High Priests to communicate with God.

In the book, the main character Santiago is a shepherd who seeks to follow his personal legend or purpose in life. He is given a pair of Urim and Thummim by a king who also helps him understand the importance of using them properly to receive spiritual guidance. Santiago believes they will help him on his journey and uses them to make important decisions.

Some interpretations suggest that Urim and Thummim may have been physical objects such as stones, while others believe they were a symbolic representation of divine communication. In the context of "The Alchemist," they represent a tool that can help the seeker divine their destiny and the path they should take in life.