....and there it is! Is yours named in your book? If not, how on earth did you find it?
I'd like to say that I've learnt The ABoK by heart but, really, I remembered seeing it in The ABoK and then I used the forum search function ("prusik abok")
These things will happen! For instance, I happened to notice the single strand star knot (ABoK #1396) after reading about the knot on this forum!?
Ciao,
s.