The CGS-ESU units for magnetic quantities are seldom used,[3] and don't have special names. Sources tend to just use 'esu' or the derived unit expressed in terms of the CGS base units. For example, the unit for magnetic induction is g1/2/cm3/2, corresponding to ccgs gauss, and corresponding to ccgs × 10−4 tesla, where ccgs = c / (cm/s) = 29979245800 is the numeric part of speed of light c expressed in CGS units.[4][5]