I am pretty sure “femto-” is used in a meaning of “small”, similar to pico-, nano-, micro- etc https://en.m.wikipedia.org/wiki/Femto- https://en.m.wikipedia.or

I am pretty sure “femto-” is used in a meaning of “small”, similar to pico-, nano-, micro- etc https://en.m.wikipedia.org/wiki/Femto- https://en.m.wikipedia.org/wiki/Femto-