This tag is for questions about the top users of the Stack Exchange sites and the lists of those users.

The tag is for questions about the top users of the Stack Exchange sites and the lists of those users. There are lists in various places like on stackexchange.com/leagues; there's also a top user ranking for each tag on every site with an URL of the form <site>/tags/<tag-name>/topusers, for example the top users list for this tag. Informally, it's also used for the default view of the general user list found at /users/, because it opens on the Reputation tab by default.