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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.

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For questions about the copyrights of the StackExchange sites themselves or about the posting of copyrighted material by users.
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For questions about, well, questions: how to ask, whether specific questions are appropriate, and so forth.
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Per-site lists of tags that cannot be created.
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a 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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For issues with how Stack Exchange sites look or work that are specific to Google's Chrome browser.
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From Oxford Dictionaries, paraphrasing to suit the needs of *this site*: "A website or web page on which (in our case) M.SE records opinions, links to other sites, etc. on a regular basis".
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For questions about the mobile versions of Stack Exchange sites. For questions about the mobile apps, use the [android-app] and the [ios-app] tags as needed.
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to be used for the Official Stack Exchange application only. The app is available in the App Store, for iOS 7 on iPhones only. When posting bug reports, please specify the app's version.
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For questions about single users having multiple accounts.
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the percentage of questions for which the user has accepted an answer.
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to new users and fosters and community spirit among existing ones.
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For question related to missing context close reason.
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for questions involving the 'Front Page' - the list of top questions with activity
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Questions about the "hot questions list" which appears on the main page and truncated on all pages in the SE network, as well as its effect on Math SE.
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for questions about the official Stack Exchange Android App
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fetched and displayed on the Stack Exchange network. This is not for general Gravatar support inquiries.
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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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a process which helps cleaning the site by deleting some questions. Criteria for auto-deletion are based on low score and age of the question.
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For questions and requests to merge multiple Stack Exchange accounts of the same user.
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the act of temporarily blocking the account of a specific user.
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Locking a question prevents answering, editing, commenting, voting, closing, and reopening. Answers must be locked separately and may still be voted upon. Only diamond moderators may lock posts.
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For every user, the reputation from the main site is shown on meta. However scores of the posts on meta are still stored, so it is possible to obtain reputation-based badges on meta (mortarboard, tag …
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for questions about the CSS styles used in Marthematics SE.
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When your question gets the community to have a vote
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General questions about users and user accounts.
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a user-generated list of related questions shown when viewing a question. Its content comes from questions that users have linked in the question, their answers, or i…
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distinguish humans from bots.
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websites copying content from other websites. Use this tag for questions related to sites copying contents from math.SE. (In particular, if this is done without proper attribution.)
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"The Dupehammer" refers to the ability of tag gold badge owners to unilaterally close and reopen duplicates which were asked in tags of which they have a golden badge.
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For questions regarding the badge tracking functionality in the user profile area.
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for questions about posts that violate the SE 'Be Nice' policy