Not an embellishment at all. Via 'man units': "The conversion information is read from a units data file that is called 'definitions.units' and is usually loca

Not an embellishment at all. Via 'man units': "The conversion information is read from a units data file that is called 'definitions.units' and is usually located in the '/usr/share/units' directory." Via definitions.units (L. 223), you can see the milli- prefix: https://gist.github.com/anonymous/f06769de95e0c7f9e658#file-definitions-units-L223 https://gist.github.com/anonymous/f06769de95e0c7f9e658#file-... Via deifnitions.units (L. 1060), you can see the lightsecond unit: https://gist.github.com/anonymous/f06769de95e0c7f9e658#file-definitions-units-L1060 https://gist.github.com/anonymous/f06769de95e0c7f9e658#file-... Maybe check it for completeness? Edit: Spelling