Its magic. Can’t believe we have the technology to do so.it does mean we’re fast approaching the hard limit where new innovations will have to be made beyond making the electronics smaller and more dense.

It’s also bullshit as it has no bearing on the actual properties of the chips. Manufacturers use these as product names. Here’s an article discussing it.

https://www.pcgamesn.com/amd/tsmc-7nm-5nm-and-3nm-are-just-numbers