F 7/Gb
The F 7 chord consists of the F (Perfect unison), A (Major third), C (Perfect fifth) and Eb (Minor seventh) notes, with Gb as the bass note.

How to play the F 7/Gb chord
- Play Gb as the lowest bass note in the left hand
- Find F (Root) on the piano keyboard
- Add A (Major third) — 4 semitones above F
- Add C (Perfect fifth) — 7 semitones above F
- Add Eb (Minor seventh) — 10 semitones above F
- Press all 5 notes simultaneously to sound the F 7/Gb chord