用于表示圆或弧的中心，还可表示对称。
Use to indicate the centers of circles and arcs, and to represent symmetry.
他用维恩图解中的两个重叠的圆的交集来表示在自我的两个对立面重叠处暴露出的真我。
He USES a Venn diagram of two overlapping circles to make the point that the true self emerges when the opposite features of ourselves overlap.
实心圆表示活动图的起点，实际上是一个占位符，带边框的实心圆表示终点。
The filled circle represents the starting point of the activity diagram, effectively a placeholder, and the filled circle with a border represents the ending point.
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