F# major/D
The F# major chord consists of the F# (Perfect unison), A# (Major third) and C# (Perfect fifth) notes, with D as the bass note.

How to play the F# major/D chord
- Play D as the lowest bass note in the left hand
- Find F# (Root) on the piano keyboard
- Add A# (Major third) — 4 semitones above F#
- Add C# (Perfect fifth) — 7 semitones above F#
- Press all 4 notes simultaneously to sound the F# major/D chord