A day that is an exact number of years (to the day) since a given significant event occurred. Often preceded by an ordinal number indicating the number of years.
A day subsequent in time to a given event by some significant period other than a year (especially as prefixed by the amount of time in question).
Such a day that commemorates a wedding.
A sign or other marker that indicates the way along a road or trail.
Something that guides or marks the way along a figurative journey; a temporary stopping point.