`man units` tells me that the only remaining prefixes that aren't the same character as a unit are D I O Q U X - upper case are prefered for positive powers, and a prefix ending in -a (lower case and -o for negative powers). I think I and O would be ruled out for looking like l and 0, and X might be prefered to be reserved for 'unknown'.
So, Dottametres, Quinkametres, Umametres.
Biting the hand that feeds IT
