Ab 5/F
The Ab 5 chord consists of the Ab (Perfect unison) and Eb (Perfect fifth) notes, with F as the bass note.

How to play the Ab 5/F chord
- Play F as the lowest bass note in the left hand
- Find Ab (Root) on the piano keyboard
- Add Eb (Perfect fifth) — 7 semitones above Ab
- Press all 3 notes simultaneously to sound the Ab 5/F chord