The F sharp major seventh sharp eleventh chord is a 5-note chord consisting of the notes F#, A#, C#, E# and B#.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as F#maj#4.
Chords that are a superset of F#maj#4. The chords include more notes but always F#, A#, C#, E# and B#.
Chords that are a subset of F#maj#4. These contain less notes but all of them are included in F#maj#4.
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 F#maj#4 chord. Feel free to save or share the image as needed.