piano chord
F♯7
F♯1A♯3C♯5E♭7
Major triad, minor seventh. The chord that wants to resolve a fourth up.
Written the other way round it is G♭7 — the same twelve keys on a piano, a different piece of notation.
What is true of it
F♯7 is F♯, A♯, C♯ and E — 1, 3, 5 and b7 counted from F♯.
On an instrument that cannot reach all 4, the 5 goes first, in that order.