Db 3/A
The Db 3 chord consists of the Db (Perfect unison) and F (Major third) notes, with A as the bass note.

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