piano chord
F♯maj7
F♯1A♯3C♯5E♯7
Major triad with a major seventh: a half step below the root, an octave up.
Written the other way round it is G♭maj7 — the same twelve keys on a piano, a different piece of notation.
What is true of it
F♯maj7 is F♯, A♯, C♯ and E♯ — 1, 3, 5 and 7 counted from F♯.
On an instrument that cannot reach all 4, the 5 goes first, in that order.