Yes, I think this is a meta tag based on the [criteria of Jeff Atwood](http://meta.superuser.com/questions/1376/is-data-an-useful-tag-do-we-need-it-what-should-we-do) and [his blog post](http://blog.stackoverflow.com/2010/08/the-death-of-meta-tags/): > 1) could you have a question with ONLY this tag I don't think so, [missing-files] and [data-loss] are better than [missing], [data] and [loss]. > 2) does the tag commonly mean different things to different people Yes, people are left to wonder what is missing. ---------- As [disappeared] is just a synonym tag to [missing] it is also a meta tag.