Ancient Egyptian gods are tricky things.  First there's the matter of the spelling--the transliterated hieroglyphic for the goddess depicted in this approximately three-thousand-year-old amulet is variably rendered in English as "Nwt", "Nuit," "Newit" or "Nut."  Nut was the Egyptian sky goddess, who gave birth to the stars and the morning sun.  

There is also another common variation:  the image of the deity itself.   In Nut's case, she could be a woman, a cow, or, as here, a sow--all conveying an image of fecundity.  Or perhaps something more sinister:

It is not surprising that, as mother of the stars, she should have taken the form of a great sow, for the female pig’s habit of eating her own piglets must have been well known.