are: an internationally agreed system of units based on the metre, kilogram, second, ampere, kelvin, mole and candela. [P1.1]
stands for: Système International d'Unités. [P1.1]
are used: almost universally by the scientific community. [P1.1]
See Tables 1 to 5 in Section 0 of the Maths handbook.
Copyright 1997, The Open University