The SE software requires you to specify at least one tag when posting, and is a special tag that you're not supposed to be able to add directly.

How did this question have, as its sole tag, in its first revision? It was not migrated from another site, which is how that usually happens.

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  • 1
    In other news, untagged has accumulated a bunch of questions, presumably in large part because of single-use tags evaporating. (Re)taggings there are welcome! Jan 21, 2015 at 18:56

1 Answer 1


Because the blacklist I put in place to prevent folks from using that tag didn't get used for a really long time and the system deleted it.

I've restored it, along with some descriptive text:

  • Is there a way to lock the tag so it can not be deleted? Maby put on a locked question?
    – hildred
    Jan 23, 2015 at 13:58

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