Milestone; Milepost
A stone set up to record distances to and from different points. The Romans set up milestones that also recorded the date of their erection, (with the relevant emperors), though at Roman mile intervals. These were used as later markers.
Similarly mileposts were set up by turnpikes and toll roads. These might also be stone - but some metal shield-shaped examples survive.
To explore more glossary entries click on a letter.