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