piano chord
F♯5
F♯1C♯5
Root and fifth, no third at all — neither major nor minor, which is the point.
Written the other way round it is G♭5 — the same twelve keys on a piano, a different piece of notation.
What is true of it
F♯5 is F♯ and C♯ — 1 and 5 counted from F♯.