rubric

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.

a direction for the conduct of divine service or the administration of the sacraments, inserted in liturgical books.

written, inscribed in, or marked with or as with red; rubrical.

Archaic. red; ruddy.

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

a set of rules of conduct or procedure

written, printed, or marked in red