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.
Questions about sizes and other quantities of MSE, e.g. number of questions, GB/day transferred, etc.
For questions about real time web chat that accompanies Mathematics Stack Exchange site.
Relating to the discussion and controversy around questions that are tagged, explicitly stated as, presumed, or suspected to be homework questions (i.e. those given to a student in a formal course of …
Here, "design" refers to front-end elements, such as page layout, coloring conventions, etc. For questions about database structure, algorithms in the code, &c., please use the tag [architecture] inst…
The process of migrating off-topic questions from one Stack Exchange site to another.
a lightweight markup language used across the entire Stack Exchange network for post formatting.
For questions which focus on a particular user, rather than those discussing general user issues. NOTE: For questions regarding suspected fraudulent behavior by specific users, please prefer flagging …
the process, to emphasize, layout and decorate a text for a better user-experience.
The various user interface and email elements used to notify users of events on the site.
an editable page that briefly summarizes the topic of the tag and that may provide links to existing questions that are often useful to many people. Sometimes tag-wiki also includes short …
those questions which have neither an accepted answer nor answers with positive vote count. Note that our definition is strict!
For the discussion related to the MathOverflow site, our sister site for professional mathematicians.
no Meta Meta Math.SE, so questions about this very site just get this tag.
use for any questions related to deleted answers specifically.
designed to help new reviewers hone their moderation skills, while nudging more experienced users that don't seem to be paying close attention to what they're revi…
For questions on usage of links at MSE (both links to various parts of this site and to other sites).
A tag for questions about the community wiki feature (regardless of whether or not the questions themselves are community wiki).
for questions specific to upvotes, the community's way of telling peers that their content was clear and helpful. Up-votes on the meta sites may have different meanings.
Questions dealing with moderator actions, pages, abilities or decisions.
Questions about various privileges you obtain by earning reputation points.
Questions that deal with general issues regarding new users and their assimilation into the Math Stack Exchange community.
For discussions about contest questions posted on this site.
the act of casting many successive upvotes or downvotes on the posts of a specific user.
For questions about the favorite question feature or the favorite tags feature.
Some changes to questions, such as edits or receiving new answers, will "bump" them back onto the site's front page where the changes can be vetted by other users.
The user profile page, which contains a list of all the questions, answers, and an audit trail of the user's activity on the site.
For discussions about posts which ask for verification of OP's solution or proof.
Questions also answered by the user asking, easily marked by the shaded user card attached to the answer.