B sus2/F##
The B sus2 chord consists of the B (Perfect unison), C# (Major second) and F# (Perfect fifth) notes, with F## as the bass note.

How to play the B sus2/F## chord
- Play F## as the lowest bass note in the left hand
- Find B (Root) on the piano keyboard
- Add C# (Major second) — 2 semitones above B
- Add F# (Perfect fifth) — 7 semitones above B
- Press all 4 notes simultaneously to sound the B sus2/F## chord