Demon related to the genesis of the world
Iynx (‘sounding’, cf. ἰύζω/iýzō) refers to 1. a bird, 2. a humming wheel used in magical rites, and 3. a demon in theurgy who is associated with the origin of the world and mediates between humans and gods.
In myth the bird is transformed from a seductive nymph, the daughter of Echo or Peitho and perhaps Pan (Callim. Fr. 685; Phot. and Suda, s.v. I.), or from a woman who competed with the Muses in singing (Nicander in Antoninus Liberalis 9).