So the next one should be milli.
Unity? We could also have an unpronounceable empty string, and refer to it as TEFKAM, The Editor Formerly Known As `milli`.
For what I assume are historical reasons, the empty string is usually called "lambda".
pico, nano, micro, milli, unit, kilo, Mega, Giga... Which relates to the SI units.
And Micro,Meso and Macro scaling system that centers around human sized reality.
So the next one should be milli.