We had a big tussle here at the Ranch over the terms "Anonymous Object" and "Anonymous Array".
During the dust-up, I noted that the term "anonymous array" occurs in the index to the 815 book, and references page 184, which contains neither the words nor any anonymous arrays.
I don't remember how much use you make of "anonymous arrays" in the 815 book but there are a lot of very key ones on pages 188 and 189 of the printed book.
Interestingly, as far as I can tell, you neither define, nor make use of the term "anonymous array" itself anywhere in the text, tho there are limited usages of the concept.
There might be more I forgot, I was quickly reviewing Chapters 5 & 6 of the 815 book before diving head first back into Chapters 3 & 4 of the 816 book, which are pretty heady stuff, and I noticed the cited usages and the "broken link" of the term in the index.