Ab sus4/Ebb
The Ab sus4 chord consists of the Ab (Perfect unison), Db (Perfect fourth) and Eb (Perfect fifth) notes, with Ebb as the bass note.

How to play the Ab sus4/Ebb chord
- Play Ebb as the lowest bass note in the left hand
- Find Ab (Root) on the piano keyboard
- Add Db (Perfect fourth) — 5 semitones above Ab
- Add Eb (Perfect fifth) — 7 semitones above Ab
- Press all 4 notes simultaneously to sound the Ab sus4/Ebb chord