The concept of chemical bond is commonly used to understand key features of the structure and properties of molecules and solids. The prototypical bonding types, like covalent, ionic, and metallic bonds, are widely discussed in the textbooks; however, several other interactions, including hypervalent, donor-acceptor, pnictogen, chalcogen, halogen, and multicenter bonding, have also been found beyond such idealized bonding descriptions . Since the chemical bond is an elusive and controversial concept because it is not directly given by a quantum-mechanical operator , several approaches have been developed over the last few decades to analyze the different types of chemical bonding in solids based on quantummechanical wavefunctions and electron densities. In this regard, chemically meaningful entities, such as bonding electron pairs (Lewis pairs) and lone electron pairs (LEPs), can be analyzed using natural bond orbitals , Wannier functions , electron localization function (ELF) , and the chemical-pressure formalism , among others.