A double bond refers to a type of chemical bond that involves the sharing of two pairs of electrons between two atoms. However, in scientific literature, there are several synonyms for double bond, including "dual bond," "diatomic bond," or "pi bond." A dual bond, like a double bond, involves the sharing of two electrons, while diatomic and pi bonds involve the sharing of electrons along two different axes. Additionally, "cis- and trans-bonds" are used to describe geometric isomers that occur in some double bonds. Overall, synonyms for double bonds allow scientists to describe the same phenomenon using different language, depending on the context within which the bond occurs.