这是一个箭头图标，用于选择和取消选择图表中的点。

This is the arrow icon and is used to select and deselect points in the chart.

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这一点并没有严格的要求，但是定制的图标看起来要好一些。

It is not strictly required, but a custom icon looks nice.

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您可以通过选择图 1 右上角的图标来验证这一点。

You can verify this when the icon, as illustrated in Figure 1, in the right, top side is highlighted.

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