G major sharp eleventh (lydian) piano chord - Gmaj9#11
The G major sharp eleventh (lydian) chord is a 6-note chord consisting of the notes G, B, D, F#, A and C#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Gmaj9#11.
Interactive piano diagram for the G major sharp eleventh (lydian) chord
Chords that are a subset of Gmaj9#11. These contain less notes but all of them are included in Gmaj9#11.