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

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