F# m9/D
The F# m9 chord consists of the F# (Perfect unison), A (Minor third), C# (Perfect fifth), E (Minor seventh) and G# (Major ninth) notes, with D as the bass note.

How to play the F# m9/D chord
- Play D as the lowest bass note in the left hand
- Find F# (Root) on the piano keyboard
- Add A (Minor third) — 3 semitones above F#
- Add C# (Perfect fifth) — 7 semitones above F#
- Add E (Minor seventh) — 10 semitones above F#
- Add G# (Major ninth) — 14 semitones above F#
- Press all 6 notes simultaneously to sound the F# m9/D chord