piano chord
F♯
F♯1A♯3C♯5
A major third and a perfect fifth over the root.
Written the other way round it is G♭ — the same twelve keys on a piano, a different piece of notation.
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.