C# sus4/F#
The C# sus4 chord consists of the C# (Perfect unison), F# (Perfect fourth) and G# (Perfect fifth) notes, with F# as the bass note.

How to play the C# sus4/F# chord
- Play F# as the lowest bass note in the left hand
- Find C# (Root) on the piano keyboard
- Add F# (Perfect fourth) — 5 semitones above C#
- Add G# (Perfect fifth) — 7 semitones above C#
- Press all 4 notes simultaneously to sound the C# sus4/F# chord