God Osiris was god of dead and posthumous life as well as rebirth and crop god. He was depicted as an mummified human, he often held a crutch, quirts and his head was decorated with atef crown. His skin could be green (fertility), black (black Nile alluvion) or white (linen bandage colour on mummies).
Pillar Djed was one of his attributes, stability symbol, which equaled his spine and he was worshipped especially in his cult center Busiris in Nile delta. However his main cult centre was legendary funerary place Abydos, where he was worshipped together with his sister and wife Isis and son Horus. Osiris was a member of significant Heliopolitan Ennead, which apperead in pyramid texts from Old Kingdom period for the first time - more precisely in 5. dynasty times.