What does IYA stand for? 

Iya

In Lakota mythology, Iya is a storm-monster, brother of Iktomi the spider. He eats humans, animals and consumes villages to satisfy his otherwise endless appetite. This fact, however, does not make him bad or evil; he simply performs a duty and is considered a sacred being. He is the eye of the storm, and offers protection to those caught in his wake. The tornado, the snowstorm, the hurricane or the thunderstorm would all be considered manifestations of this deity. He travels with his storms in a fabulous tipi painted with magical symbols, and when he appears, he is often faceless and formless. His home is said to be under the waters, where he resides with his mother, Unk. He is considered to be the chief of the North, symbolically encompassing the spheres of winter, famine and disease. He is the guardian of the Aurora Borealis and holds to a rivalry against both the chief of the South, Okaga, as well as the thunderbirds, though this is vastly exaggerated in tales told to outsiders. He is the younger brother of Iktomi, and the pair comprises the two progeny of Inyan, the creator, who is the head of the Lakota pantheon.

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