Real Dictionary

rubric
countable noun: A rubric is a set of rules or instructions, for example the rules at the beginning of an examination paper.

rubric in American English
in early books and manuscripts, a chapter heading, initial letter, specific sentence, etc. printed or written in red, decorative lettering, etc.
inscribed in red
adjective: written, inscribed in, or marked with or as with red; rubrical
noun: a title, heading, direction, or the like, in a manuscript, book, statute, etc., written or printed in red or otherwise distinguished from the rest of the text

rubric in British English
noun: a title, heading, or initial letter in a book, manuscript, or section of a legal code, esp one printed or painted in red ink or in some similarly distinguishing manner