https://doi.org/10.1351/goldbook.B00741
A @L03518@ attached to two or more, usually metallic, central atoms.
Sources:
Blue Book, p. 338 [Terms] [Book]
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1091 [Terms] [Paper]
Red Book, 3rd ed., p. 149 [Terms] [Book]