An omphalos is a religious stone artifact, or baetylus. In Ancient Greek, the word ὀμφᾰλός (omphalós) means "navel". Among the Ancient Greeks, it was a widespread belief that Delphi was the center of the world. According to the myths regarding the founding of the Delphic Oracle, Zeus, in his attempt to locate the center of the earth, launched two eagles from the two ends of the world, and the eagles, starting simultaneously and flying at equal speed, crossed their paths above the area of Delphi, and so was the place where Zeus placed the stone.