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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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keywords or labels that categorize and group your question with other, similar questions.
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For questions about discussing the quality or appropriateness of certain questions on Puzzling Stack Exchange.
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should be used when you ask a question on meta that is referencing question(s) on the main site. For example, if you have a question about why questions on Puzzling Stack Exchange ar…
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for questions on whether a question, or category of questions, falls within the site scope
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Indicates that the report has been resolved through the implementation of a feature or the fixing of a bug.
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for posts about the fortnightly topic challenges.
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For questions about discussing the quality or appropriateness of certain answers on Puzzling Stack Exchange.
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for questions about answers: how to answer, whether specific answers are appropriate, and so forth.
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used to hide text unless hovered over. They are done by starting lines with '>! '.
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for questions about tag synonyms (how they work, who can create them, etc). Use [synonym-request] for tag synonym requests.
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for questions on Meta that relate to a specific question on Puzzling Stack Exchange.
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for instructions and guidance on closing or migrating questions, and the reasons for those closures.
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Questions regarding etiquette and proper behaviour in relation to other users, SE posts, etc.
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denotes a question that is a part of the regularly held "best-puzzle" voting contests.
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for questions specifically about the process of asking questions on Puzzling Stack Exchange.
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For questions about the process of editing, how edits work, and other general inquiries about the edit system.
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"Design" refers to front-end elements, such as page layout, coloring conventions, etc. For questions about database structure, algorithms in the code, please use the "architecture" tag instead.
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For questions about the rules and policies of Puzzling Stack Exchange.
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For questions about the /review path where users can view and act on posts by other users that the system thinks may need attention.
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the real time, stateful web chat that's a part of every Stack Exchange site.
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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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small addendum to each question or answer, intentionally limited in size and formatting. Comments are second-class citizens.
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for questions dealing with moderator actions, pages, abilities or decisions.
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a JavaScript engine for displaying mathematics.
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refers to all questions deleted. The tag "specific-question" should also be used when referencing a specific question that has been deleted.
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the primary way users gain reputation, and also how many items are sorted to the top.
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held to choose moderators for Puzzling Stack Exchange
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A slight or indirect indication or suggestion. It helps to solve a puzzle and is usually hidden under spoiler.
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a Q&A on Meta where you can test, e.g. ideas for new puzzles or features of the Stack Exchange system. This way, they don't cause any noise on the main site.
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For questions about the practice of answering one's own question: rules, etiquette, suggestions, and so on.
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allowable or desirable in question titles.