an established rule, guide, custom, or tradition for something, such as a document that outlines the criteria by which a project, test, or academic assignment will be assessed or scored;
e.g. Make sure to consult the rubric for advice on the characteristics of a good essay.
(noun)
the name or title given to something to establish its class or category or to otherwise classify it;
e.g. I am not sure which rubric your question falls under, so you could submit it as a general inquiry.