E sus4/F#
The E sus4 chord consists of the E (Perfect unison), A (Perfect fourth) and B (Perfect fifth) notes, with F# as the bass note.

How to play the E sus4/F# chord
- Play F# as the lowest bass note in the left hand
- 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 4 notes simultaneously to sound the E sus4/F# chord