Astonishing. <15 Si atoms wide
Historically the oxide layer is 1/10 the minimum line width, but I think they have different methods to do the isolation now.
How long did it take to get this generation on line?
Taiwanese chip giant TSMC is to begin volume production of 3nm silicon within weeks, amid warnings that demand for semiconductors is weakening with Korean companies reporting the first drop in shipments for three years. TSMC has revealed that its production of 3nm semiconductors is due to start in September, as indicated by …
There is no actual 3nm dimension in a 3nm design
The most generous description would be that if you extrapolated the last real planar junction designs in terms of transistors /mm^2 it would be as if a planar transistor design was 3nm
Alternatively you could accept that it's just the odd number less than the previous named technology. Don't know what they are doing in 2025 after 1nm. Either 0.5nm and we start going fractional or we get silly and say -1nm