What is a “closed” question?
Just out of curiosity.
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It might not be exactly what you're looking for, in the sense that it's not necessarily accurate for every SE site, but if you're wondering about Stack Overflow/Server Fault/Super User, there's a screen capture of the close window on the Privileges Wiki page.
Edit: There's also a list of reasons in this FAQ answer. Which kind of makes this a dupe...