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