To the AE the symbol of an encircled 5pointed star denoted the Duat:-

I identified the region of the sky that the ancients referred to as the Duat and present the work graphically through the medium of geometry -in its most basic form it’s a (big) triangle. (it is also demonstrated how it incorporates other geometric variations, as well as a circle).

It has a dual application (celestial & terrestrial) and I projected this triangle onto the Globe (as on the book’s cover.)
My reference, in this context, is to the terrestrial projected triangular shape thus;- Duat triangle: [tooth/thorn] and observation of its the position in relation to the plane of the Ecliptic.

The hieroglyph for Isis/Sirius is a triangle and hieroglyph triangles also refer to [the land on one side of the Nile] –this projected triangle straddles polar longitude, thus the Nile…

the word: tepi [beginning/ base of triangle/ tooth]

I wish to repeat that these are tit bits of a comprehensive work and therefore complex in a dissected form but do respect that all questions are valid – justification in isolation just complicates it.