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Drill 2D selection Mode :
This mode allow to select points using the shape of a 2D polygon

Create a points could
Add some polygons facing this cloud and select them
Run Custom Select , and choose "Drill 2D"
Result : all point in front of the polygons normals are selected.
Add a new point cloud behind the polygons
Run Custom Select, and then check 'Double sided'
Points behind the polygons are also selected