piano chord
G♭maj9
G♭1B♭3D♭5F7A♭9
A major seventh with a ninth on top.
Written the other way round it is F♯maj9 — the same twelve keys on a piano, a different piece of notation.
What is true of it
G♭maj9 is G♭, B♭, D♭, F and A♭ — 1, 3, 5, 7 and 9 counted from G♭.
On an instrument that cannot reach all 5, the 5 and 1 go first, in that order.