Noun

• S: (n) guideline (a light line that is used in lettering to help align the letters)
• direct hypernym / inherited hypernym / sister term
• S: (n) road map, guideline (a detailed plan or explanation to guide you in setting standards or determining a course of action) "the president said he had a road map for normalizing relations with Vietnam"
• S: (n) guidepost, guideline, rule of thumb (a rule or principle that provides guidance to appropriate behavior)