The F sharp minor eleventh chord is a 6-note chord consisting of the notes F#, A, C#, E, G# and B.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as F#m11.
Chords that are a subset of F#m11. These contain less notes but all of them are included in F#m11.
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#m11 chord. Feel free to save or share the image as needed.