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The vernacular of the halogen bond parallels the hydrogen bond. For example, the hydrogen bond donor references a molecule or group that contains a Lewis acidic hydrogen atom, while the hydrogen bond acceptor is the Lewis basic molecule or group in the interaction. In describing a halogen bond, the donor refers to the molecule with an electrophilic halogen atom (or simply the atom itself, for example, a bromine donor), and the halogen bond acceptor is the Lewis basic site. Therefore, the common notation for denoting a halogen bond is R–X⋯Y, where R is a covalently bound species, X is any halogen with an electrophilic region, Y is the halogen bond acceptor with an electron‐rich region, and ⋯ indicates the attractive noncovalent interaction. Table 1.1 highlights common R–X species and several typical Y species.