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

scribes did not understand the sense of the syllable ⁂⁂, some of them adding the bird of evil ⁂, others the ⁂ determinative of _mountain_. The name on the Sarcophagus of Seti (Bon. II, A. 30) has a snake for determinative, and some papyri call him _Ṭuṭu_. The god may be recognised in later texts. In the Calendar of Esneh there is a feast on the 14th day of Thoth, in honour of ⁂⁂⁂⁂⁂, Tutu, ‘the son of Neith,’ and the text gives the important determinative ⁂, of a _serpent_, _worm_, or _slug_. I feel sure, therefore, that we should in the text read the name Tutu, and consider ⁂ as a determinative.[123] The symbolism would then be identical with that in Pl. XXIII, illustrative of Chapter 87. The Sun-god there rises up like a worm out of the Lotus of Dawn, whereas in another picture a slug (⁂) is seen moving upon the flower. ⁂⁂, _Ati_, where the god makes his appearance, is the name of the ninth Nome of Lower Egypt.