I created this because I wanted to find a way to unite {List of Links, Collections and Resources, Repository, List of Related Sites, List of Blogs, List of Podcasts, Programming Resources} without linking each of those items to each other (which, in the absence of transclusions, also means you would have to update each link separately every time you added a new related list of lists).
But I accidentally caused the URL to be "list-of-lists-1", because I originally relabelled List of Links to List of Lists but then changed my mind.
Btw, I notice the absence of a tag for lists (e.g. lists of advice that don't link to anywhere and aren't repositories designed to elicit advice from the comment section).
This tag is a list of lists of lists, which means that a tagged item must be a list of lists. This can include posts and tags on LessWrong, or of external websites. It is intended to help you get a bird's eye view over everything you can get a bird's eye view over, which can be usefwl for filling out blindspots (unknown unknowns) in your map of the map—or to calibrate your distribution of value of information over the territory.
Inspired by Wikipedia's List of Lists of Lists.
Aliases: lists, list of lists, list of repositories, list of resources, list of collections
Note: If you make a new tag with lists of something, consider linking back to this page.
See also my other comment on all this list-related tag business. Linking it here in case you (the reader) is about to try to refactor stuff, and seeing this comment could potentially save you some time.