The G sharp major ninth chord is a 5-note chord consisting of the notes G#, B#, D#, F## and A#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as G#maj9.
Chords that are a superset of G#maj9. The chords include more notes but always G#, B#, D#, F## and A#.
Chords that are a subset of G#maj9. These contain less notes but all of them are included in G#maj9.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the G#maj9 chord. Feel free to save or share the image as needed.