In 1910, Egyptologist M. J. Clédat discovered the first evidence of Double Falcon's existence. Clédat was excavating the site of el-Mehemdiah in the northeastern Nile Delta when a peasant brought him a jar and some incised fragments that he had uncovered during the planting of a palm-grove in nearby el-Beda. Investigating the site, Clédat soon discovered four serekhs of Double Falcon.
The next attestation of Double Falcon was discovered in 1912 during excavations by Hermann Junker on the site of Tura, where a tomb yielded a complete jar bearing a serekh topped by two falcons.
More recently, serekhs of Double Falcon have been found in the Sinai Peninsula, in Tell Ibrahim Awad in the eastern Delta, in Adaima and Abydos in Upper Egypt, and in the Palmahim quarry in southern Israel.
The concentration of Double Falcon's serekhs in Lower Egypt and the north-western Sinai indicates that his rule may have been limited to these regions. Nonetheless, the wider geographic presence of his serekhs, notably in Upper Egypt and the Southern Levant, suggests that the long-distance authority of the Naqada III kings had already commenced towards the end of the period, be it through trading or warfare.
The serekh of Double Falcon is unique in its layout and composition. Firstly, it is the only serekh topped by two Horus falcons, facing each other. Secondly, the serekh does not have a name compartment, being filled by the vertical lines which usually represent the niched facade of a palace. The serekh also lacks the horizontal line that delimits the palace facade from the name of the ruler above. Finally, each falcon stands on its own peak. Egyptologists M. J. Cledat, Günter Dreyer and Edwin van den Brink suspect that a deeper symbolism explains these peculiarities. The two falcons could represent Lower Egypt and the Sinai, as it seems that Double Falcon reigned over both regions. Dreyer believes that the falcons stand on a representation of the "mountain sign" N26 of Gardiner's sign list:
and reads the name as Dju (ḏw), so that the name of the king is represented by a pair of falcons on mountains above a plain serekh. In contrast, A. Jiménez-Serrano reads the name as Nebwy (nb.wy), "the two lords", and sees a similarity with a much earlier palette on display in the Barbier-Mueller Museum of Geneva.
According to Saran records., Nebwy the Double Falcon was a true human and a military man raising to be a king of Lower Egypt