piano chord
E♭9
E♭1G3B♭5D♭♭7F9
A dominant seventh carrying a ninth on top.
Written the other way round it is D♯9 — the same twelve keys on a piano, a different piece of notation.
What is true of it
E♭9 is E♭, G, B♭, D♭ and F — 1, 3, 5, b7 and 9 counted from E♭.
On an instrument that cannot reach all 5, the 5 and 1 go first, in that order.