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 Sa that of Horus Sa which would place Sa in the 2nd dynasty since Hotepsekhemwy was the first ruler of that dynasty. Thus, Helck proposed that Horus Sa is the Horus-name of another shadowy ruler of the 2nd dynasty, Weneg, whose Horus-name is otherwise unknown. The Egyptologist Jochem Kahl recently challenged this hypothesis, identifying Weneg with Raneb. Alternatively, Kaplony reconstructed the Horus-name of Weneg from the Cairo fragment of the Palermo stone as Wenegsekhemwy. In both cases, Horus Sa cannot be the Horus-name of Weneg and the two would not designate the same king. Consequently, Kaplony equated Horus Sa with "njswt-bity