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

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