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

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