Ma'at
In the mythology of ancient Egypt, the goddess Ma'at, daughter of sun god Ra and air goddess Shu, married the moon god Thoth. She represented balance, order, law, justice and truth. The hieroglyph of her name means straight, or that which is straight.
Winged like Isis, Ma'at (also called Maat or Mayet) may carry the life sign of the ankh as well as a sceptre. She wears an ostrich feather in her headdress.
Since it was her duty to judge truth at the trial of the dead, the feather may symbolize the fine judgments expected of this important figure. Her devotion to order and balance stood in opposition to the forces of chaos.