A question on "electrical wall" and "magnetic

In even/odd mode analysis. Some literatures usually use the concept
of "electrical wall" and "magnetic wall".

For "electrical wall", we might denote the ground plane where all electical field is
terminated in this plane?

Then, how about "magnetic wall"? How it establish its literal meaning with open a circuit plane?

Thank you!

First, "electrical wall" denotes a plane that electric fields are perpendicular to it, and second, "magnetic wall" means a plane that electric fields are tangential to it.