C - Commands   
CPOLYGON (command)
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It defines a selection through a polygonal line: the selection will include the clipped objects.

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 Command line CPOLYGON

Select all the objects clipped by a CPOLYGON selection. The CPOLYGON method is similar to the WPOLYGON one, except for the fact that CPOLYGON selects the clipped objects as well.

Specify the vertexes of the polygonal selection line, then press ENTER to close it or [UNDO]:Specify a point or enter U to delete the last point or else press ENTER to end.