I'm not sure since I've never seen it before, but I did a quick Google search and it looks like it's from the ProtoGeometry.dll file that comes with Dynamo. Here's the link I used if you're curious.
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I'm not sure since I've never seen it before, but I did a quick Google search and it looks like it's from the ProtoGeometry.dll file that comes with Dynamo. Here's the link I used if you're curious.