Page "Centimetre–gram–second system of units" Paragraph 0

The centimetre – gram – second system ( abbreviated CGS or cgs ) is a variant of the metric system of physical units based on centimetre as the unit of length, gram as a unit of mass, and second as a unit of time.

All CGS mechanical units are unambiguously derived from these three base units, but there are several different ways of extending the CGS system to cover electromagnetism.