Every fingering that fits a hand
x664
easy
ba99
hard
ba9x
easy
x669
moderate · barre · no 5
What is true of it
F♯ is F♯, A♯ and C♯ — 1, 3 and 5 counted from F♯.
On an instrument that cannot reach all 3, the 5 goes first, in that order.
The easiest of the 4 fingerings below is x664: 3 fingers, held at the 4th fret.
None of them uses an open string, so this chord moves up the neck unchanged — the same shape 1 fret higher is the chord a semitone above.
1 of the 4 need a barre.
1 string stays silent.
Where its notes are on the neck
The brass dots are F♯, the root. Everything else is a chord tone with its degree printed in it.
With a different note underneath
F♯/A♯
3121
F♯/C♯
666x
An inversion is the same chord with a different note lowest. The name changes to a slash name because the bass is what a listener hears as the foundation.