Please explain Visual Studio solution explorer node icon meanings

I get that <> means a XAML file and {} means a C# file.
But some of those icons are decorated with a green circle containing a + symbol in the lower right corner of the treeview icon. Other icons have a black circle at lower right. Can't figure out a consistent reason. Some of my related XAML/C# files have the black circle, which tells me that the green circle with the + symbol is NOT indicating a relationship exists. And some files without a related file DO HAVE the + decoration.

I give up. What's the answer?

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