piano chord
D♭m6
D♭1F♭♭3A♭5B♭6
A minor triad with a major sixth added, which is why it is not simply a minor chord with a flat seventh.
Written the other way round it is C♯m6 — the same twelve keys on a piano, a different piece of notation.
What is true of it
D♭m6 is D♭, F♭, A♭ and B♭ — 1, b3, 5 and 6 counted from D♭.
These are also the notes of B♭m7♭5/D♭ and A♯m7♭5/D♭. 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.