As reviewed in Table , several definitions conceptualize the chemical space as a chemical descriptor vector space set by the numerical vector D encoding property or molecular structure aspects as elements of the descriptor vector D . Based on this notion, Figure shows the chemical space concept like "M-multidimensional cartesian space" or a "chemical space table descriptors or features that encode each molecule. The length of descriptor sets corresponds to the number of dimensions defining the chemical space itself. descriptors form a "chemical space table" that be represented using different visualization methods.