The Egyptian Book of the dead by P. Le Page Renouf and Edouard Naville

solar bark. From the egg of the Abṭu there rises the great Cat, the Sun. It is, as M. Loret has proved, the _Tortoise_ of the Nile. As ⁂⁂⁂ _ȧbṭu_, ‘the _month_,’ is phonetically homonymous with ⁂⁂⁂⁂⁂ _ȧbṭu_, the Tortoise, and that the latter is characterised by ⁂, ⁂, ‘its rotation, revolving or turning,’ the word _ȧbṭu_, whether applied to ‘month’ or ‘tortoise’ clearly signifies ‘the revolving one.’ Our modern words Tortoise, Tortue, Tortuga, rather express the turning or twisting of the creature’s feet. In some texts, _e.g._, the inscriptions of Amenhotep, the son of Hapu, Mariette, _Karnak_, pl. 36, line 22, and at the beginning of the Ani Papyrus, the word is written ⁂⁂⁂ _abtu_. In the later part of the Ani Papyrus it is written with the initial ⁂⁂.