Projects → Task Plan → Viewing Options → Gantt Chart → Showing milestones
A milestone is a special task that represents an event in your project. Any task that has a duration of zero days is considered a milestone task. Any task may be flagged as a milestone task by selecting the Mark Task as Milestone option in the Task Information dialog box. Milestone tasks are displayed as diamonds in the Gantt chart and Network diagram. You can filter views to show only milestone tasks.
To show milestones
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