D# dim7/A
The D# dim7 chord consists of the D# (Perfect unison), F# (Minor third), A (Diminished fifth) and C (Major sixth) notes, with A as the bass note.

How to play the D# dim7/A chord
- Play A as the lowest bass note in the left hand
- Find D# (Root) on the piano keyboard
- Add F# (Minor third) — 3 semitones above D#
- Add A (Diminished fifth) — 6 semitones above D#
- Add C (Major sixth) — 9 semitones above D#
- Press all 5 notes simultaneously to sound the D# dim7/A chord