In general, a complete set of base units as well as derived units is called system of units.
But, it was a practice to name the system of units after three fundamental units of length, mass and time only, e.g.,
(a) FPS system—In this system length is measured in foot (F), mass in pound § and time in second (S). So this system is called FPS system. This system is also known as British Engineering system of units of simply British system of units.
(b) C.G.S. system—In this system length is measured in cm, mass in kilogram and time in second, so this system is called C.G.S. system.
© M.K.S. system—In this system length is measured
in metre, mass in kilogram and time in second, so this system is called M.K.S. system or metric system.