Bb sus2/Ab
The Bb sus2 chord consists of the Bb (Perfect unison), C (Major second) and F (Perfect fifth) notes, with Ab as the bass note.

How to play the Bb sus2/Ab chord
- Play Ab as the lowest bass note in the left hand
- Find Bb (Root) on the piano keyboard
- Add C (Major second) — 2 semitones above Bb
- Add F (Perfect fifth) — 7 semitones above Bb
- Press all 4 notes simultaneously to sound the Bb sus2/Ab chord