In Jewish mythology, the luz (Hebrew: לוּז, romanized: lûz) is a bone in the spinal column that houses the soul of the human body.
[5][6] Similarly, Saul Lieberman also mentioned that popular Jewish tradition identified the luz with the end of the spine, and understand it to be the coccyx.
[6] Within Midrash, there is an aggadah (non-legalistic exegetical story) involving a dispute regarding the luz bone between the Roman Emperor Hadrian and the rabbi Joshua ben Hananiah.
The sacrum has similar significance to the luz as a source of resurrection in Egyptian and Greek cultures contemporary to the Zohar and Talmud.
[10][11] Likewise, in Islamic thought, the bone's status as the indestructible nidus of human resurrection is repeated in several hadiths.