'C' what The Priestess reveals.

93!
It was on this day, March 18th, 1904, that Ouarda revealed that the god who was waiting was Horus, and delivered a ritual for his invocation in skeleton.
In The Equinox of the Gods, this day Crowley records the many tests he gives her to identify Horus. And though she had no knowledge of Egyptology, she passes all with ease. This climaxes in the museum, where Ouarda goes past many images of Horus, and stop and points to a glass case in the distance, saying; "There he is!"

Upon closer inspection they see that the Stele is cataloged #666. It is now known as "The Stele of Revealing" (Liber AL 3:10).

And the Word revealed through the Priestess was "Horus!"