The G sharp eleventh chord is a 5-note chord consisting of the notes G#, D#, F#, A# and C#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as G#11.
Chords that are a superset of G#11. The chords include more notes but always G#, D#, F#, A# and C#.
Chords that are a subset of G#11. These contain less notes but all of them are included in G#11.
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#11 chord. Feel free to save or share the image as needed.