The B-sharp half-diminished seventh chord (abbreviated "B#m7(b5) chord") is a four-note chord consisting of the notes B, D, F, and A. The chord is formed by lowering the fifth of a B-sharp minor seventh chord a half step.

Name
B-sharp half-diminished seventh chord
Synonyms
B-sharp half-diminished chord B-sharp minor seventh flat five chord
Notes
B D F A
Intervals
1 3 5 7
Chord symbol
Bm7(b5)
Alternative symbols
Bø Bø7 Bm7b5 B7(b5) Bmi7(b5) Bmin7(b5)
Type
tetrad (four-note chord)

B#m7(b5) chord on piano

B#m7(b5) chord on guitar

B#m7(b5) chord on ukulele

B#m7(b5) chord on the staff