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I just had to edit out of this question, clearly discussing HTTP status code 400 Bad Request, which uses .

I thought that tags composed only of numbers could not be created. Was this is a recent change, or am I misremembering the block?

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I've never heard of this rule myself. The only thing that comes to mind as far as numbers is only moderators can create version-specific tags or whatever that exact rule is. Although, I can't really think of any good examples where a number alone would make a good tag. So if this isn't a rule, it probably should be. – animuson Dec 27 '12 at 1:25
up vote 3 down vote accepted

I'm pretty sure you're misremembering.

Tags with numbers in them are sometimes interpreted as version tags, which has some flaws, but other than that... if the tag itself is just a number because that's the concept it refers to, that seems fine to me.

Perhaps "http-400" might be a better choice in this case, but if I were asking question, I'd probably just search for the number "400" when typing in a tag anyway.

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FWIW, there's a fleet of html-status-code-FOO tags. Wasn't responsible for the naming, but they're not horrible. I'll take verbosity over brevity when naming things... – Charles Dec 27 '12 at 1:27
There's already a http-status-code-400 tag, which is the second result that comes up when you do search for "400" in the tag suggestion box (minus the new 400 tag). – animuson Dec 27 '12 at 1:27
@Charles Fair enough. The point remains - number-only tags aren't explicitly disallowed. Synonyms/merges can be set up if they're misused, though. – Adam Lear Dec 27 '12 at 1:33

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