Stereochemistry is the branch of chemistry that deals with the study of the spatial atomic arrangement that forms the molecular structure.
R/S system is the nomenclature system for enantiomers.
In this type of nomenclature, eachchiral center is assigned R or S following a system by which its substituents are each assigned a priority based on atomic number, following the Cahn-Ingold-Prelog rules.
The R means Rectus in Latin (means right) and S means Sinister in Latin (means Left).
Molecules that rotate the plane polarised light to right is said as R isomer.
Molecule that rotate the plane polarised light to left is said as S isomer.