Tags

A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

"Community Bulletin" is the block of links that appears near the top of the right-hand sidebar on most pages, consisting of featured posts, events, blog entries, and hot meta posts.
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For questions about exporting and printing MathOverflow posts.
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Indicates that the feature request or bug is something that is intended to be implemented or fixed, but not in the near term.
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Indicates that a change in functionality is currently under consideration, or needs further investigation.
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Questions about the hot questions list which appears on the main page and—truncated—on various sites in the Stack Exchange network (but not on this site), as well as its effect on MathOverflow.
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For questions about the 'follow questions and answers' functionality, where you receive updates about a post as if you were the post owner.
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Times a question has been seen by eyeballs, or a profile has been looked over
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For questions about the public lists of changes made to posts by a site's users. They are available for questions and answers by clicking the "edited X min ago" link, and on tag wikis as "history" and…
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Protected questions have the additional restriction that users with low reputation are not permitted to answer the question.
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A message displayed to alert the user to a problem or potential problem.
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The "Linked Questions" sidebar is a user-generated list of related questions shown in the sidebar when viewing a question. Its content comes from questions that users have linked in the question, thei…
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for questions regarding unregistered users.
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For questions about MathOverflow newsletter - possibility of getting an email with top posts.
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For questions involving the "Ignored Tags" specified in a user's Preferences. Questions with these tags are dimmed or removed entirely from question lists.
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Spoilers are text which is hidden until you move cursor above it. It might be useful when for separating full solution from a hint.
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The black bar across the top of the MathOverflow site. (Similarly, on others Stack Exchange sites.)
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Questions that have been closed as duplicates may sometimes be merged by moderators. One question is retained as a stub while all answers appear on the other.
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for discussing platform-wide changes to StackExchange, especially how they impact the MathOverflow site.
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OpenId is an open standard that allows users to log in to many websites with a single set of third-party credentials.
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for sandbox questions, which allow people to write answers meant for testing of a particular issue, or a draft for a later answer.
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For questions about the various RSS feeds provided by Stack Exchange sites.
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A question concerning saves - a place in user's profile where various lists of questions and answers can be collected.
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For questions about how Gravatars are fetched and displayed on the Stack Exchange network. This is not for general Gravatar support inquiries.
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For questions about the "Oops! Something Bad Happened!" server error page displayed on Stack Exchange sites in the event of an internal server error, or for reporting server errors received anywhere o…
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The undisclosed algorithm through which all new questions are passed to determine if they can be posted on SE.
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For questions about various userscripts and bookmarklets.
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For questions related to how the site looks, feels and behaves when its responsive design comes into play
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Indicates that the post shares product or configuration change concepts during the Discovery phase. Open to receiving feedback from the Community preceding implementation.
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