Akh (ꜣḫ)
Transfigured spirit — the effective dead
Akh — the 'effective' or 'transfigured' state achieved by a successful deceased after the union of ka and ba. The akh is what the funerary ritual is for: not preservation but transformation. Once an akh, the deceased is among the imperishable stars (the circumpolar stars in the northern sky), and capable of acting on behalf of, or against, the living. Letters to the dead are addressed to the akh.
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Pyramid Texts, Utterance 422 (primary_canonical)
“I have come to thee, my father; I have come to thee, Osiris; I have wiped thy face, I have clothed thee with the garment of the gods. I am an akh among the akhs.”