God of the sense of touch, or feeling, and of knowledge and understanding. He was said to be born from the drops of blood that flowed when the sun god Ra mutilated his p**is. He was subsequently invoked as a protector of the genitals of the deceased. Sia appeared in the Book of the Dead as one of the gods who watches the heart of the deceased being weighed during the great judgment scene.
He is portrayed as a man with a fringed headband. A variant spelling is Saa.
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