F minor/A#
The F minor chord consists of the F (Perfect unison), G# (Minor third) and C (Perfect fifth) notes, with A# as the bass note.

How to play the F minor/A# chord
- Play A# 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
- Press all 4 notes simultaneously to sound the F minor/A# chord