piano chord
G♭m7
G♭1B♭♭♭3D♭5F♭♭7
Minor triad with a minor seventh. The same four notes as a major sixth chord a third above.
Written the other way round it is F♯m7 — the same twelve keys on a piano, a different piece of notation.
What is true of it
G♭m7 is G♭, B♭♭, D♭ and F♭ — 1, b3, 5 and b7 counted from G♭.
B♭♭ is a double flat, and it has to be: every letter from G♭ upwards is used once, so the b3 cannot be written any other way.
These are also the notes of A6/G♭. Which name is right depends on what is underneath and what came before — the notes alone do not decide.
On an instrument that cannot reach all 4, the 5 goes first, in that order.