piano chord
G♭m
G♭1B♭♭♭3D♭5
The major triad with its third lowered by a half step.
Written the other way round it is F♯m — the same twelve keys on a piano, a different piece of notation.
What is true of it
G♭m is G♭, B♭♭ and D♭ — 1, b3 and 5 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.
On an instrument that cannot reach all 3, the 5 goes first, in that order.