Necronomicon- Voorish Sign

On the evening of September 2nd the last major barrier gave way, and Dr. Armitage read for the first time a continuous passage of Wilbur Whateley’s annals. It was in truth a diary, as all had thought; and it was couched in a style clearly shewing the mixed occult erudition and general illiteracy of the strange being who wrote it. Almost the first long passage that Armitage deciphered, an entry dated November 26, 1916, proved highly startling and disquieting. It was written, he remembered, by a child of three and a half who looked like a lad of twelve or thirteen.
...

They from the air told me at Sabbat that it will be years before I can clear off the earth, and I guess grandfather will be dead then, so I shall have to learn all the angles of the planes and all the formulas between the Yr and the Nhhngr. They from outside will help, but they cannot take body without human blood. That upstairs looks it will have the right cast. I can see it a little when I make the Voorish sign or blow the powder of Ibn Ghazi at it, and it is near like them at May-Eve on the Hill. The other face may wear off some. I wonder how I shall look when the earth is cleared and there are no earth beings on it. He that came with the Aklo Sabaoth said I may be transfigured, there being much of outside to work on.”

- The Dunwich Horror, part VIII