The earliest Osiris symbol is the djed, and his earliest place of worship, Dedu, the old Busiris on the Nile delta. The interpretation of the djed pillar has remained a puzzle to this day.
Neumann identifies the Djed as the primordial Osiris symbol and the locus of the oldest Osirian cult, framing its interpretive difficulty as central to understanding the deeper psychic transformation it encodes.
, The Origins and History of Consciousness (Princeton, 2019thesis