Inside the Universes

'SI_system'

[systeme_international_d'unites.n.01] as in: a complete metric system of units of measurement for scientists; fundamental quantities are length (meter) and mass (kilogram) and time (second) and electric current (ampere) and temperature (kelvin) and amount of matter (mole) and luminous intensity (candela)

Examples:
Today the United States is the only country in the world not totally committed to the Systeme International d'Unites