piano chord
G♭add9
G♭1B♭3D♭5A♭9
A major triad with a ninth added and no seventh — which is what tells it apart from a ninth chord.
Written the other way round it is F♯add9 — the same twelve keys on a piano, a different piece of notation.
What is true of it
G♭add9 is G♭, B♭, D♭ and A♭ — 1, 3, 5 and 9 counted from G♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.