@Steven Cranmer said

"I'm not sure why a name so clearly pointing to Horus would be assigned to this very Thoth/Hermes type of task in the Golden Dawn, though."
Nor I, but I notice that all the business and bureaucracy of the Book of the Law is in the 3rd chapter -- instructions for printing and publishing the book, admonition to be businesslike, etc. For all the blood and swords and macho bluster, the god of chapter 3 seems almost pedantically Mercurial. My favorite example is vv 48-9: "Now this mystery of the letters is done, and I want to go on to the holier place. I am in a secret fourfold word ..." He promises that he's done with words, then goes right on talking about words! I note, perhaps irrelevantly, that Mercury and Mars were conjoined at the midheaven during the dictation of the book.

"in some varieties of British English, presumably including Crowley's, Hua (Arabic for "he" and used as a title of God) and Hoor would be pronounced the same."

Sounds a bit Bostonian to me...

Seriously, though, this is an interesting parallel. In the Golden Dawn, there were two angelic beings with similar names that were invoked by the Adeptus Minor in different circumstances:

HUA, the Great Avenging Angel, was imagined to be present when the new Adpetus Minor took the Obligation... ready to strike if the Oaths were broken.

HRU was the "Great Angel set over the operations of the Secret Wisdom," i.e., the Golden Dawn's lengthy Tarot divination procedure called the "opening of the key." I'm not sure why a name so clearly pointing to Horus would be assigned to this very Thoth/Hermes type of task in the Golden Dawn, though.

I've seen lots of Internet confusion between these two names. But maybe there are deeper links between them. All the sea-tossing, fire and brimstone, in that poem in Konx om Pax, can certainly relate to the Golden Dawn's Avenging Angel, but maybe also to the Ra-HRU-Khuit of Chapter III of Liber AL, as well!

Steve