milestone
A milestone, generally, refers to a fixed sign that is built on a road, and is usually set up at intervals to show its location and distance from a particular destination. The old milestone is a stone, and now mostly switch to metal plate. Roads, roads, railways may be a milestone. The number on the milestone indicates how far the distance is from the starting or ending. Modern project management uses a milestone concept to measure project progress with a stage-specific deliverables. The other meaning of a milestone is a matter of a major landmark event, a typical event of a particular meaning, or a significant event of a groundbreaking significance, or a recognized event with significant academic theoretical significance. ...