Hi Mr. Yuri - a "naked edge" is an open edge that is not joined between 2 surfaces.

A solid like a box has no naked edges - every edge of the box is a spot where 2 surfaces meet up.

If you create a plane surface for example that will have naked edges at its boundaries since it is not connected to another surface there.

If you're trying to make a solid you can't have any naked edges and that script above is a good way to see where they are at, those will basically be openings in the "skin" of your object that is preventing it from being watertight.

- Michael