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 inscriptions. Especially the bird-sign at the top of the "Ka"-house might also depict a swallow, which would make the inscription to be read as "Wer-sa-hut-Ka" ("great protection of the Ka-house"). Ilona Regulski prefers the reading as a Horus-bird, though she doesn't explicitly see it as the name of a king. She dates the inscriptions to the end of Khasekhemwy's reign. The burial place of Horus Sa is unknown. Nabil Swelim associated Horus Sa with the unfinished enclosure of Gisr el-Mudir in west Saqqara. This hypothesis has not gained wide acceptance and the Gisr el-Mudir has been attributed to various second