piano chord
G♭maj7
G♭1B♭3D♭5F7
Major triad with a major seventh: a half step below the root, an octave up.
Written the other way round it is F♯maj7 — the same twelve keys on a piano, a different piece of notation.
What is true of it
G♭maj7 is G♭, B♭, D♭ and F — 1, 3, 5 and 7 counted from G♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.