The F 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 Fmaj#4.
Chords that are a superset of Fmaj#4. The chords include more notes but always F, A, C, E and B.
Chords that are a subset of Fmaj#4. These contain less notes but all of them are included in Fmaj#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 Fmaj#4 chord. Feel free to save or share the image as needed.