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

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