piano chord
D♭add9
D♭1F3A♭5E♭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 C♯add9 — the same twelve keys on a piano, a different piece of notation.
What is true of it
D♭add9 is D♭, F, A♭ and E♭ — 1, 3, 5 and 9 counted from D♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.