Akh

The akh was the aspect of a person that would join the gods in the underworld being immortal and unchangeable. It was created after death by the use of funerary text and spells, designed to bring forth an akh. Once this was achieved that individual was assured of not 'dying a second time' a death that would mean the end of one's existence.
Found on http://www.egyptartsite.com/glossary.html

akh

in Egyptian religion, the spirit of a deceased person and, with the ka and ba (qq.v.), a principal aspect of the soul. By enabling the soul to ... [1 related articles]
Found on http://www.britannica.com/eb/a-z/a/35
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