When I stared at this question (revisions) and I even thought [question refined] as offical status of the post.
<somebody removed it now, So, I've edited this question to get same effect>
How about official status [closed] as
Or
to clarify from those?
I'd like to see it added as a special (non user selectable) tag similar to the [status-declined] type tags here on meta.
Not only would that give an immediate visual indication, but it would also have the extra benefit(?) of allowing you to include/exclude .[closed] questions in searches
Edit: I forgot, but as @waiwai933 pointed out, you can already search for closed questions (closed:1)... however I still think the visual indication alone makes it worth implementing.
If you wanted to take the idea further though, you could expand the [closed] tag to different tags for each close reason (i.e. [closed-duplicate], [closed-not-programming], [closed-subjective], [closed-off-topic], [closed-too-local], [migrated-to-meta], [migrated-to-so], [migrated-to-su], [migrated-to-sf]) then you'd get some potentially useful search abilities since you'd be able to find questions closed for specific reasons... (plus you could find all questions migrated /questions/tagged/migrated~, or all questions closed (not migrated) /questions/tagged/closed~).
This is an old feature request, but I can't disagree. I think putting it maybe to the left would work better like:
[Closed] Question Title
or for duplicates:
[Duplicate] Question Title
would look better in my opinion.
