piano chord
D♯m9
D♯1F♯♭3A♯5C♯♭7E♯9
A minor seventh with a ninth on top.
Written the other way round it is E♭m9 — the same twelve keys on a piano, a different piece of notation.
What is true of it
D♯m9 is D♯, F♯, A♯, C♯ and E♯ — 1, b3, 5, b7 and 9 counted from D♯.
On an instrument that cannot reach all 5, the 5 and 1 go first, in that order.