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

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