In Egyptian mythology, Nephthys is a goddess of the underworld, as well as childbirth. The name was also used as a title for the oldest woman in any household. She may have been another form of Bat or Neith.
In Egyptian art, her hair is similar to or the same as the cloth used to shroud corpses. She was depicted with a basket or a house on her head, and sometimes as a kite, falcon, hawk or other bird. She is a daughter of Nuit and Seb and the wife of Set, with whom she is the mother of Anubis. She is the sister of Isis, with whom she is often depicted.
Son of Nepthys and Set (or possibly Osiris according to some sources) and nephew to Isis he was regarded as one of the Osirian family.
Nepthys wears the horns and solar disc, or may be shown with the vulture headdress, which symbolises the movement of consciousness from one level to another.
Nepthys' symbol, which is often shown as a part of her headdress in pictograms, is the bowl or chalice and as such reflects all Holy Grail symbology.
As she was also seen as a bird, she gradually became seen as a vulture, which the egyptians believed never had children due to being believed to all be female (they thought vultures were spontaneously created from air).
This was described in myth by stating that a sexually frustrated Nepthys disguised herself as Isis to appeal to Set, but he did not notice her since he was gay, and had a boyfriend (Ash), but Osiris, Isis' husband, did, mistaking her for Isis, and resulting in the birth of Anubis.
Later, Nepthys, as the air, was identified as the source of rain, which only occurred frequently south of Egypt, and so was seen as the creator of the Nile river.