piano chord
D♭13
D♭1F3A♭5C♭♭7E♭9B♭13
Seven notes in theory and four or five in anyone’s hands: root, third, seventh and thirteenth carry it.
Written the other way round it is C♯13 — the same twelve keys on a piano, a different piece of notation.
What is true of it
D♭13 is D♭, F, A♭, C♭, E♭ and B♭ — 1, 3, 5, b7, 9 and 13 counted from D♭.
On an instrument that cannot reach all 6, the 5, 9 and 1 go first, in that order.