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

How to play the A# minor/C# chord
- Play C# as the lowest bass note in the left hand
- Find A# (Root) on the piano keyboard
- Add C# (Minor third) — 3 semitones above A#
- Add F (Perfect fifth) — 7 semitones above A#
- Press all 4 notes simultaneously to sound the A# minor/C# chord