The correct spelling is centistoke. The ratio of a absolute viscosity of a liquid in centipoise to the density. It is a cgs unit of kinematic viscosity in customary use that is one hundredth of a stokes.
1 centistroke = 0.96 centipoise
CST stands for centistokes, which is a unit of measurement for dynamic viscosity. It is commonly used to quantify the thickness or resistance to flow of fluids, like oils and lubricants. The higher the CST value, the more viscous the fluid is.