Supplementary units (now derived): radian (plane angle), steradian (solid angle).

Key derived units with special names: Newton (N = kgm/$s^2$), Joule (J = Nm), Watt (W = $\frac{J}{s}$), Pascal (Pa = $\frac{N}{m}$^2), Hertz (Hz = $s^{-1}$), Coulomb (C = A*s), Volt (V = $\frac{J}{C}$), Ohm (Omega = $\frac{V}{A}$).