A# 3/G#
The A# 3 chord consists of the A# (Perfect unison) and D (Major third) notes, with G# as the bass note.

How to play the A# 3/G# chord
- Play G# as the lowest bass note in the left hand
- Find A# (Root) on the piano keyboard
- Add D (Major third) — 4 semitones above A#
- Press all 3 notes simultaneously to sound the A# 3/G# chord