| bun | br bundle branch |
|---|---|
| CLBBB | complete left bundle branch block |
| CRBBB | complete right bundle branch block |
| DNB | dinitrobenzene; Diplomate of the National Board [of Medical Examiners]; dorsal nonadrenergic bundle |
| GB | gallbladder; glial bundle; goof balls; Guillain-Barre [syndrome] |