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

Name
A-sharp diminished chord
Synonym
A-sharp diminished triad
Notes
A C E
Intervals
1 3 5
Chord symbol
Ao
Alternative symbols
Adim Am(b5) Amb5
Type
Triad (three-note chord)

A#dim chord on piano

A#dim chord on guitar

A#dim chord on ukulele

A#dim chord on the staff