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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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For discussions about the site's scope - what questions and topics should and should not be on-topic on the site.
349 questions
for Meta discussions about a specific question on the main site.
199 questions
For discussions about the site's tags - what tags we should have (and which ones should be removed), and what topics each tag should or should not include.
191 questions
Applies to meta questions about "homework"-tagged questions on the main site.
177 questions
169 questions
116 questions
For questions about MathJax, which is used to write mathematics on Stack Exchange sites.
100 questions
87 questions
Feedback relating to the appearance of the site.
85 questions
65 questions
Indicates that the reported behavior is intentional and not subject to change
60 questions
For questions about the /review path where users can view and act on posts by other users that the system thinks may need attention.
47 questions
For (meta) questions about the policy to disallow non-mainstream physics questions on the main site. For details, see the tag wiki.
43 questions