The English archaeologist Flinders Petrie excavated the royal cemetery at Abydos in the year 1900 and found this the oldest royal "serek" indicating a king. The serek is a standing rectangle imitating the royal residence and its facade with the king's name written within. The sign shows two arms reaching for the sky and has always been the word "ka" in the Egyptian language, meaning - "soul" and inter- preted as the spirit of man, both in and after life on earth.
Another sulotion is a bow (sometimes seen as an arch) which do occur with symbols from other kings, like "Scorpion". A paintig showing this sign can be seen on the Ka's main text through the link at the bottom of this page.
Ka's name was painted and carved on lots of pot- sherds, and his tomb was identified as being placed between those of Narmer and Iry-Hor.
He is believed to have reigned in the late dynasty "0", one generation prior to the final unification.