In the book "Making of Egypt" British Egyptologist W.M. Flinders Petrie, refers
"The Aunu People. Besides these types, belonging to the north and east, There is the aboriginal race of the Anu, or Aunu, people (written with three pillars), who became a part of the historic inhabitants. The subject ramifies too doubtfully if we include all single-pillar names, but looking for the Aunu, written with the three pillars, we find that they occupied Southern Egypt and Nubia, and the name is also applied in Sinai and Libya.
As to the Southern Egyptians, we have the most essential document, a portrait of a chief, Tera-neter, roughly modeled in relief in green glazed faience, found in the early temple at Abydos. Preceding his name, his address is given on this earliest of visiting cards, "Palace of the Aunu in Hermen city, Tera-neter." Hemen was the name of the god of Tuphium (Lanz., Dict, 544), 13 miles south of Luqsor. Erment, opposite to it, was the place of Aunu of the south, Aunu Menti. The next place in the south is Aunti (Gebeleyn), and beyond that Aunyt-seni (Esneh).
The chief peculiarity of the figure is the droop of the chin; this is caused by a slanting jaw with short ramus. The same type of jaw is seen in the ivory king from Abydos, and moreover, the Scorpion king who preceded Nar-mer.
These figures are, then, the precious portraits remaining of the native pre-Menite kings of the south, and they are of a type certainly different from the dynastic type of the square-jawed Nar-mer (Mena) and his follows.
The difference of the slope of jaw in the Aunu people was illustrated by our researchers in the cemetery at Tarkhan. In dealing with the remains, the jaws were all photographed in position, and they show two groups of the slope of the lower edge as 20 and 28 to the horizontal.
Now we can go a step further. On the big mace-head of the Scorpion king there are carved the standard figured. These emblems of Min and Set, with rekhyt plovers handing from them. The rekhytu people, however, were the special care of the dynastic race, protected by Aha and by Thetu. They were an organized rank ruled by a mayor in the Vth and VIth dynasties. The Scorpion king was, then, an enemy of the dynastic falcon, Horus.
As we find the Aunu strong in the south, but the rekhytu strong in the north, it seems that the rekhytu came in with the dynastic invasion, entering the Nile valley at Koptos. Those who went south were attacked by the Aunu, and those going north founded a base at Heliopolis (Syro-Egypt, 2).
The heads on pl. XXXVIII are arranges to show the difference of type between the Aunu; the dynastic people, the 1st dynasty in Sinai, the IInd dynasty, Khosekhem; the IIIrd dynasty, Sudany, Sanekht, and Zeser."
More on the same from the webpage.
Below is a photograph of a "Tera-neter"
Throw some more light on these people, would you folks?