piano chord
E♭add9
E♭1G3B♭5F9
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 D♯add9 — the same twelve keys on a piano, a different piece of notation.
What is true of it
E♭add9 is E♭, G, B♭ and F — 1, 3, 5 and 9 counted from E♭.
On an instrument that cannot reach all 4, the 5 goes first, in that order.