1) Anything serving as a guide 2) Crossroad sign 3) Direction giver 4) Guideline 5) Regulation 6) Rule 7) Rule of thumb 8) Sign that shows the way 9) Traveler s aid 1) Fingerboard 2) Fingerpost 3) Signpost 
• (n.) A post at the fork of a road, with a guideboard on it, to direct travelers.
Guide'post` noun A post at the fork of a road, with a guideboard on it, to direct travelers. 
[n] - a rule or principle that provides guidance to appropriate behavior
guideline noun a rule or principle that provides guidance to appropriate behavior
a post, usually mounted on the roadside or at the intersection of two or more roads, bearing a sign for the guidance of travelers. · anything serving as a guide; guideline.