One of my earliest memories is of reading a book, a Χmas gift, with small scientific prefixes:
- milli-
- micro-
- nano-
- pico-
- femto-
- atto- (one quintillionth)
While I no longer have the book, it’s probable zepto- and yocto- were present, indeed Yocto was privately investigated for rUNSWift.
Today, I learnt there is also ronto- and quecto-, since 2022.
Peter Johannes Schmidt 