The B-sharp diminished chord (abbreviated "B#dim chord") is a triad consisting of the notes B, D, and F. The chord is formed by lowering the fifth of a B-sharp minor chord a half step.

Name
B-sharp diminished chord
Synonym
B-sharp diminished triad
Notes
B D F
Intervals
1 3 5
Chord symbol
Bo
Alternative symbols
Bdim Bm(b5) Bmb5
Type
Triad (three-note chord)

B#dim chord on piano

B#dim chord on guitar

B#dim chord on ukulele

B#dim chord on the staff