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
Horus and Harsiese "Horus, Son of Isis". Nekheny may have been another falcon god worshipped at Nekhen, city of the falcon, with whom Horus was identified from early on. Horus may be shown as a falcon on the Narmer Palette, dating from about the 31st century BC. In early Egypt, Horus was the brother of Isis, Osiris, Set and Nephthys. As different cults formed, he became the son of Isis and Osiris. Isis remained the sister of Osiris, Set and Nephthys. The "Pyramid Texts" (c. 2400–2300 BC) describe the nature of the pharaoh in different characters as both Horus and Osiris.