Default node icon.
String, default = ''
For any node if its icon property is not defined, then default icon will be used. The icon property is a css class for the icon span. See .nodes to see how to use icon for nodes. The difference between img and icon is that img uses a div and a background image. The icon property uses a span and icon fonts, such as font-awesome.
You can define it during object creation: Or any time after the object has been created:

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