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.

should be used when you are expecting a large number of diverse answers to a question.
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For questions about the bookmark feature (previously called favorite questions).
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those questions which have neither an accepted answer nor answers with positive vote count. Note that our definition is strict!
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For questions about user accounts that have been deleted, or the general process of account deletion.
For questions concerning MathOverflow as non-profit organization. (As opposed to questions concerning MathOverflow as a website.)
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an editable page that briefly summarizes the topic of the tag and that may provide links to existing questions that are often useful to many people. Sometimes tag-wiki also includes short …
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User accounts can be temporarily banned ("suspended") by ♦ moderators for violation of the site rules. Use this tag for any questions related to user suspensions.
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blocked from asking new questions, or posting new answers.
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For questions related to public dumps of MathOverflow and Stack Exchange data.
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For questions about arXiv trackbacks.
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Questions about the tools available for users with at least 10000 points of reputation.
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For questions about bonus reputation obtained when associating SE accounts.
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the name currently used for the old meta site of MathOverflow, which is now hosted on http://mathoverflow.tqft.net/ In contrast to the current site it was not Q&A based.
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the act of casting many successive upvotes or downvotes on the posts of a specific user.
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use for any questions related answer that are deleted, or in a deleting process.
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For questions about citation helper feature.
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For discussions about blacklisted tags and proposals to blacklist some tags.
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Questions about the live Markdown preview of posts as they're being typed.
For questions about tag watching (previously called favorite tags). This feature allows a user to select a set of tags on a Stack Exchange site for highlighting in question lists.
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For questions about single users having multiple accounts, known as sock accounts.
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Questions related to the "side bar"; the bar that runs down the right side of the page on Stack Exchange sites.
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Questions about the Mathematics Educators StackExchange site.
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Reproduction of significant parts of content of MO happens on some other sites. Some of them are covered by the license others are not. Questions on both types can be asked under this tag.
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Proposals for new entries for the FAQ.
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For questions about the words and phrases which are blocked from appearing in posts or titles.
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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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A message displayed to alert the user to a problem or potential problem.
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for questions on Meta that relate to a specific answer on MathOverflow. (If a linked answer serves only as an example of a more general issue you want to discuss, this tag should not be u…
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