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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.

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Questions about the tools available for users with at least 10000 points of reputation.
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the answer the question owner thought best met their needs. Accepting is encouraged but never required. This tag is for *discussing* issues related to accepted answers, not indi…
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For questions concerning area51 proposals.
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Questions specifically about the process of asking questions on this site.
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For questions about bonus reputation obtained when associating SE accounts.
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awarded to encourage and incentivize positive community actions within the site.
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should be used when you are expecting a large number of diverse answers to a question.
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For questions about the words and phrases which are blocked from appearing in posts or titles.
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For discussions about blacklisted tags and proposals to blacklist some tags.
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a way to get additional attention for a question by offering some of your own reputation for great answers.
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Some changes to questions, such as edits or receiving new answers, will "bump" them back onto the site's front page where the changes can be vetted by other users.
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for questions and bug reports related to the SE chat system.
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For questions about citation helper feature.
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For questions concerning citation of posts from MO and citation of other resources when posting here.
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For questions related to closed questions (and on-hold question) and also process of closing in general.
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For questions about comment @replies
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 the user named Community ♦ present on MathOverflow (and other Stack Exchange sites.)
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A tag for questions about the community wiki feature (regardless of whether or not the questions themselves are community wiki).
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For questions about the copyrights of the Stack Exchange sites themselves or about the posting of copyrighted material by users.
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Cross posting refers to posting the same, or almost the same, question (or post) on different sites in the Stack Exchange network (or possibly also elsewhere).
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The Stack Exchange Data Explorer (SEDE) allows you to create and run queries against copies of the databases of popular Stack Exchange sites.
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For questions about user accounts that have been deleted, or the general process of account deletion.
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use for any questions related to deleted answers.
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for questions deleted from the site. The tag 'specific-question' should also be used when referencing a specific question that has been deleted.