The term 'written in red' is a phrase used to describe something that is particularly important or noteworthy. It is often used to draw attention to a particular point or to emphasize the importance of a certain message. The six-letter crossword solution for this phrase is RUBRIC, which is defined as a set of criteria or guidelines used to evaluate performance or measure achievement. Rubrics are commonly used in education to help students understand what is expected of them and to provide a consistent way to assess their work.