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.
For questions about the timeline view of questions, accessible using the clock icon next to the post or via "/posts/xxx/timeline".
12 questions
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 …
12 questions
For issues with how Stack Exchange sites look or work that are specific to Firefox.
12 questions
For questions related to specific review audits that appear to be faulty or with which you disagree.
11 questions
"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.
11 questions
Questions that have been closed as duplicates may sometimes be merged by moderators. One question is retained as a stub while all answers appear on the other.
10 questions
For questions about various counters showing number of views of a particular question, profile page, ...
10 questions
For questions related to the support of HTTPS by Mathematics Stack Exchange, which is finally live as of spring 2017.
10 questions
10 questions
For questions relating to the reputation tab in user profiles.
10 questions
10 questions
10 questions
Indicates a post used for submitting and voting on Community Promotion Ads.
10 questions
For questions involving the "Ignored Tags" specified in a user's Preferences. Questions with these tags are dimmed or removed entirely from question lists.
10 questions
Indicates that a change in functionality is currently under consideration, or needs further investigation.
9 questions
9 questions
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Grace period is time within which actions can be revised without a trace in the system. This includes a period in which you can undo and change your vote; a period where editing posts can be done free…
9 questions
9 questions
For questions discussing possibilities to privately contact other users.
9 questions
For questions about the "protected" in "protected question."
9 questions
For questions related to the sort orderings of questions, answers, and other lists on SE sites.
9 questions
9 questions
For questions about timestamps that appear in notices and tooltips upon hovering those notices.
8 questions
"Community Bulletin" is the new block that replaces the "Visit Meta" block that was before used on Stack Exchange sites.
8 questions
8 questions
Friendly comparison chart showing the reputation gains and losses between users on a site
8 questions