The B diminished seventh chord (abbreviated "Bdim7 chord") is a four-note chord consisting of the notes B, D, F, and A. The chord is formed by adding a diminished seventh to a B diminished chord.

Name
B diminished seventh chord
Synonym
B fully diminished chord
Notes
B D F A
Intervals
1 3 5 7
Chord symbol
Bo7
Alternative symbols
Bdim7 Bdim Bo
Type
Tetrad (four-note chord)

Bdim7 chord on piano

Bdim7 chord on guitar

Bdim7 chord on ukulele

Bdim7 chord on the staff