A sign or post beside a railway marking the distance from the (actual or nominal) start of a line (usually the principal terminus or junction with a more major line)
A post on a highway, often with one or more fingerposts, showing the distance in miles to nearby places
To place mileposts along (a road, etc.).
A crossroads.
A T-junction.
A decisive point at which a significant change or historical event occurs, or at which a decision must be made.
A maximum or minimum on a graph.