What is a singular trim? How does it look?

Rhino Rhino for Windows
1

I’m looking for the intersection of a straight line with a trim, I came across a singular trim, is it a trim which is represented by a single point? What is it for?

2

Please set the category for this topic to provide some context. Grasshopper, developer, …?

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3

When all control points of one side of a surface end in a single point, this is a singular trim.

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