the number of nanometers used to name process nodes (see the International Technology Roadmap for Semiconductors) has become more of a marketing term that has no standardized relation with functional feature sizes or with transistor density (number of transistors per square millimeter).
So we’re soon at 3nm, when have we reached the limit of what’s possible? An atom is 0.5nm?
Although the so-called process node is still named in nanometres, it hasn’t represented the actual transistor size in quite a while.
https://en.wikipedia.org/wiki/Semiconductor_device_fabrication#Feature_size
Pretty interesting, thanks for that link