The B-sharp diminished seventh chord (abbreviated "B#dim7 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-sharp diminished chord.

Name
B-sharp diminished seventh chord
Synonym
B-sharp 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)

B#dim7 chord on piano

B#dim7 chord on guitar

B#dim7 chord on ukulele

B#dim7 chord on the staff