This document discusses stereoisomerism in coordination compounds. It defines stereoisomers as compounds that have the same ligands coordinated to the same metal ion but differ in the spatial arrangement of ligands. There are two types of stereoisomerism: geometrical isomerism, where ligands occupy different positions around the metal ion (e.g. cis and trans isomers), and optical isomerism, where compounds are non-superimposable mirror images (e.g. dextro and levo isomers). The document discusses various examples of coordination complexes that exhibit these two types of stereoisomerism based on their coordination number and ligand structure.