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Shai Hulud is a term from Frank Herbert's science fiction novel, Dune. It refers to enormous sandworms that live beneath the surface of the desert planet Arrakis. The term "Shai Hulud" is an approximate translation from Arabic, meaning "Eternal Thing" or "Lord of Eternity"

In the novel, the sandworms play a crucial role in the economy of Arrakis. They are the source of the spice melange, a highly valuable substance that grants heightened senses and psychic abilities to those who consume it. The Fremen, a desert-dwelling people, worship the sandworms as messengers of the gods and are skilled at hunting and riding them.

Overall, the Shai Hulud are valued in the text for their precious resource, their mythical status, and their significance to the culture and beliefs of the people of Arrakis.