What is the symbol for a milestone in a Gantt chart?

In a Gantt chart, a milestone is represented by a grey diamond symbol. This visual distinction is important as it signifies key points in a project timeline that represent significant events or achievements. Milestones serve as markers to indicate the completion of major deliverables or phases of a project, helping project managers and team members track progress against the project schedule.

The choice of a grey diamond is widely recognized in project management practices, providing a clear and intuitive way to differentiate milestones from regular tasks, which are typically shown as horizontal bars. By using the diamond shape, it helps stakeholders quickly identify significant points in the project timeline without confusing them with task durations or dependencies.

Recognizing this symbol helps team members understand the overall project status at a glance, enabling better communication and coordination throughout the project lifecycle.