Running this query in the Stackoverflow editor gives you a list of reasons posts are closed:
select * from CloseReasonTypes
Id
Name
Description
1
exact duplicate
This question covers exactly the same content as earlier questions on this topic; its answers may be merged with another identical question.
2
off topic
Questions on Stack Overflow are expected to relate to programming or software development within the scope defined in the <a href=”/faq”>FAQ</a>. Consider editing the question or leaving comments for improvement if you believe the question can be reworded to fit within the scope. Read more about <a href=”/faq#close”>closed questions</a> here.
3
not constructive
As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or specific expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, <a href=”/faq#close”>see the FAQ</a> for guidance.
4
not a real question
It’s difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, <a href=”/faq#close”>see the FAQ</a>.
7
too localized
This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, <a href=”/faq#close”>see the FAQ</a>.
10
general reference
20
noise of pointless
101
duplicate
102
off-topic
103
unclear what you’re asking
104
too broad
105
primarily opinion-based