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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the real time, stateful web chat that's a part of every Stack Exchange site.
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the primary way users gain reputation, and also how many items are sorted to the top.
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Use this meta-tag for posts related to the community-determined programming challenges that happen every now and then.
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for issues of what is allowable or desirable in question titles.
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for questions referring to a non-Stack Exchange controlled entity.
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for questions specific to down-votes, the community's way of telling peers that their content can be improved. Down-votes on meta site have different meanings.
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Questions about diamond (♦) moderators, their powers, and actions they have taken.
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for questions regarding off-topic questions, including whether or not a question is on-topic and what to do with off-topic questions.
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For questions about the syntax highlighting performed inside code blocks on Stack Exchange sites.
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a lightweight, plain-text, markup language. It is used across the entire Stack Exchange network for post formatting (Questions, answers, wikis, chat).
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those questions which have no up-voted answers.
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The user interface elements and web pages that make up this site.
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those users who may be new to the Stack Exchange Q&A format, and generally have a low reputation score.
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the norms and standards of accepted behavior and politeness in our community. The golden rule is "Think before you post."
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held to choose moderators for graduated sites.
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for requests to replace one tag with another existing tag. It also applies to requests that one tag should be merged into another, or simply abandoned.
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Questions about the licensing of content on Stack Exchange sites.
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for questions dealing with moderator actions, pages, abilities or decisions.
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For topics regarding only a specific language or set of related languages.
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referring to the process of identifying and closing questions that are duplicates of another question.
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a JavaScript engine for displaying mathematics, available on some Stack Exchange sites.
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refers to all questions deleted from Stack Exchange sites. The tag "specific-question" should also be used when referencing a specific question that has been deleted.
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awarded to encourage and incentivize positive community actions within the site.
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Questions also answered by the user asking, easily marked by the shaded user card attached to the answer.
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The process by which users can vote a question re-opened if it is closed due to some users seeing it as off-topic or otherwise disallowed by the /faq.
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Answer-invalidation involves editing a question in such a way that something addressed in an answer is lost. This is disallowed on Code Review as it disrupts the review process as specified in the He…
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For concerns regarding common issues in code often pointed out in reviews.
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For the suggestion of improvements to the phrasing of text shown to users by the Stack Exchange engine.
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enter Stack Exchange posts, which supports a live preview of Markdown syntax.
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points that a user gets (and loses) on StackExchange for activities, which allow more (or less) privileges.
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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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the answer the question owner thought best met their needs. This tag is for discussing issues related to accepted answers, not indicating that a question has an accepted answer.
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for questions about the entire network of Q&A sites that make up the Stack Exchange network.