D m3/D#
The D m3 chord consists of the D (Perfect unison) and F (Minor third) notes, with D# as the bass note.

How to play the D m3/D# chord
- Play D# as the lowest bass note in the left hand
- Find D (Root) on the piano keyboard
- Add F (Minor third) — 3 semitones above D
- Press all 3 notes simultaneously to sound the D m3/D# chord