E sus4
The E sus4 chord consists of the E (Perfect unison), A (Perfect fourth) and B (Perfect fifth) notes.

How to play the E sus4 chord
- Find E (Root) on the piano keyboard
- Add A (Perfect fourth) — 5 semitones above E
- Add B (Perfect fifth) — 7 semitones above E
- Press all 3 notes simultaneously to sound the E sus4 chord