Is this symbol for shielded cables ?

[MathWizard]

I was looking at a Heathkit radio and I see the symbol and C label of a capacitor, but with a wire running through it. There's a few on the top of the page
https://www.vintage-radio.info/download.php?id=780

Down in the notes they use (    ) and say that's shielded cables, is that what those are ? ) (

[oPossum]

feedthrough capacitor

[MathWizard]

Ok thanks, I don't remember hearing of them before
https://www.utmel.com/blog/categories/capacitors/what-is-feedthrough-capacitor