This is a ring bezel, with the end broken and missing . It is inscribed with a cartouche. The Object Register states that there are two faience ring bezels and two fragments of two others, but only one is present.
From Egypt, Giza, Street G 7000, debris on floor. 1926: excavated by the Harvard University–Museum of Fine Arts Expedition; assigned to the MFA by the government of Egypt.
Harvard University—Boston Museum of Fine Arts Expedition