Yeah, that&#x27;s still a bit wierd. There&#x27;s also the [centimetre-gram-second](<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Centimetre%E2%80%93gram%E2%80%93second_system_of_units" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Centimetre%E2%80%93gram%E2%80%...</a>) system that&#x27;s used in some areas that has the prefix on the length unit.<p>On a related note, tonne (i.e metric tonne) is widely used, though not generally in the scientific arena. This is partly for historical reasons, but I think there&#x27;s an element of it being a little awkward to apply prefixes to the kilogram, as one must multiply the &quot;kilo&quot;. Nonetheless, we should exploit the full power of SI prefixes and use &quot;megagram&quot; instead. With two short syllables rather than one long syllable it takes about the same amount of time to say and is far less ambiguous.<p>This works well elsewhere; Fat Man wasn&#x27;t 21 kilotonnes of TNT, it was 21 gigagrams.