I believe, in the before time, when wikipedia was just an idea, there were these things called encyclopedias that came in many volumes. One of the volumes actually described the contents of the other volumes. Despite the encyclopedia being alphabetized, this was useful because it let you skim available topics and got you interested in them (it also got you interested in buying the other volumes).
I have a set of hand written notebooks. I'd like to create a notebook that is, similarly, about the other notebooks to remind myself where certain topics reside. I'd like to give it a name that makes clear what it is.
The notebook about the notebooks will contain a table of contents. However, the notebooks are not organized by subject, they are chronological. This means the same subject will appear scattered on different pages. When I can, I'll gather these page numbers together in a list on a line with the subject. This means it will look a bit like an index. It just won't be alphabetized. I'm doing all this by hand so I'm dealing with certain limitations.