F# dim
The F# dim chord consists of the F# (Perfect unison), A (Minor third) and C (Diminished fifth) notes.

How to play the F# dim chord
- Find F# (Root) on the piano keyboard
- Add A (Minor third) — 3 semitones above F#
- Add C (Diminished fifth) — 6 semitones above F#
- Press all 3 notes simultaneously to sound the F# dim chord