Egyptian fraction have been called "Horus-Eye fractions" after a theory (now discredited) that they were based on the parts of the Eye of Horus symbol. They were used in the Middle Kingdom in conjunction with the later notation for Egyptian fractions to subdivide a hekat, the primary ancient Egyptian volume measure for grain, bread, and other small quantities of volume, as described in the Akhmim Wooden Tablet. If any remainder was left after expressing a quantity in Eye of Horus fractions of a hekat, the remainder was written using the usual Egyptian fraction notation as multiples of a "ro", a unit equal
Four sons of Horus Pharaoh was seen as a manifestation of, or especially protected by, Horus, these "parts" of the deceased pharaoh, referred to as the Osiris, were seen as "parts" of Horus, or rather, his "children", an association that did not diminish with each successive pharaoh. Since Horus was their father, so Isis, Horus's original wife in the early mythological phase, was usually seen as their mother, although Hathor was also believed to be their mother, though in the details of the funerary ritual each son, and therefore each canopic jar, was protected by a particular goddess. Others say their mother was Serket,